1068 lines
28 KiB
Plaintext
1068 lines
28 KiB
Plaintext
[role="xpack"]
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[testenv="basic"]
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[[eql-function-ref]]
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== EQL function reference
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++++
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<titleabbrev>Function reference</titleabbrev>
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++++
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beta::[]
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{es} supports the following <<eql-functions,EQL functions>>. Most EQL functions
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are case-sensitive by default.
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[discrete]
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[[eql-fn-add]]
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=== `add`
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Returns the sum of two provided addends.
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*Example*
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[source,eql]
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----
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add(4, 5) // returns 9
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add(4, 0.5) // returns 4.5
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add(0.5, 0.25) // returns 0.75
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add(4, -2) // returns 2
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add(-2, -2) // returns -4
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// process.args_count = 4
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add(process.args_count, 5) // returns 9
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add(process.args_count, 0.5) // returns 4.5
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// process.parent.args_count = 2
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add(process.args_count, process.parent.args_count) // returns 6
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// null handling
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add(null, 4) // returns null
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add(4. null) // returns null
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add(null, process.args_count) // returns null
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add(process.args_count null) // returns null
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----
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*Syntax*
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[source,txt]
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----
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add(<addend>, <addend>)
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----
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*Parameters:*
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`<addend>`::
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(Required, integer or float or `null`)
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Addend to add. If `null`, the function returns `null`.
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+
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Two addends are required. No more than two addends can be provided.
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+
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If using a field as the argument, this parameter supports only
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<<number,`numeric`>> field data types.
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*Returns:* integer, float, or `null`
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[discrete]
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[[eql-fn-between]]
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=== `between`
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Extracts a substring that's between a provided `left` and `right` text in a
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source string. Matching is case-sensitive.
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*Example*
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[source,eql]
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----
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// file.path = "C:\\Windows\\System32\\cmd.exe"
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between(file.path, "system32\\\\", ".exe") // returns "cmd"
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between(file.path, "workspace\\\\", ".exe") // returns ""
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// Greedy matching defaults to false.
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between(file.path, "\\\\", "\\\\", false) // returns "Windows"
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// Sets greedy matching to true
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between(file.path, "\\\\", "\\\\", true) // returns "Windows\\System32"
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// empty source string
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between("", "system32\\\\", ".exe") // returns ""
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between("", "", "") // returns ""
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// null handling
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between(null, "system32\\\\", ".exe") // returns null
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----
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*Syntax*
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[source,txt]
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----
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between(<source>, <left>, <right>[, <greedy_matching>])
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----
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*Parameters*
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`<source>`::
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+
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--
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(Required, string or `null`)
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Source string. Empty strings return an empty string (`""`), regardless of the
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`<left>` or `<right>` parameters. If `null`, the function returns `null`.
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If using a field as the argument, this parameter supports only the following
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field data types:
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* A type in the <<keyword,`keyword`>> family
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* <<text,`text`>> field with a <<keyword,`keyword`>> sub-field
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--
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`<left>`::
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+
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--
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(Required, string)
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Text to the left of the substring to extract. This text should include
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whitespace.
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If using a field as the argument, this parameter supports only the following
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field data types:
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* A type in the <<keyword,`keyword`>> family
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* <<text,`text`>> field with a <<keyword,`keyword`>> sub-field
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--
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`<right>`::
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+
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--
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(Required, string)
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Text to the right of the substring to extract. This text should include
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whitespace.
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If using a field as the argument, this parameter supports only the following
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field data types:
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* A type in the <<keyword,`keyword`>> family
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* <<text,`text`>> field with a <<keyword,`keyword`>> sub-field
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--
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`<greedy_matching>`::
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(Optional, Boolean)
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If `true`, match the longest possible substring, similar to `.*` in regular
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expressions. If `false`, match the shortest possible substring, similar to `.*?`
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in regular expressions. Defaults to `false`.
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*Returns:* string or `null`
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[discrete]
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[[eql-fn-cidrmatch]]
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=== `cidrMatch`
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Returns `true` if an IP address is contained in one or more provided
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{wikipedia}/Classless_Inter-Domain_Routing[CIDR] blocks.
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*Example*
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[source,eql]
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----
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// source.address = "192.168.152.12"
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cidrMatch(source.address, "192.168.0.0/16") // returns true
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cidrMatch(source.address, "192.168.0.0/16", "10.0.0.0/8") // returns true
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cidrMatch(source.address, "10.0.0.0/8") // returns false
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cidrMatch(source.address, "10.0.0.0/8", "10.128.0.0/9") // returns false
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// null handling
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cidrMatch(null, "10.0.0.0/8") // returns null
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cidrMatch(source.address, null) // returns null
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----
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*Syntax*
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[source,txt]
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----
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`cidrMatch(<ip_address>, <cidr_block>[, ...])`
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----
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*Parameters*
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`<ip_address>`::
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(Required, string or `null`)
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IP address. Supports
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{wikipedia}/IPv4[IPv4] and
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{wikipedia}/IPv6[IPv6] addresses. If `null`, the function
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returns `null`.
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+
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If using a field as the argument, this parameter supports only the <<ip,`ip`>>
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field data type.
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`<cidr_block>`::
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(Required{multi-arg}, string or `null`)
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CIDR block you wish to search. If `null`, the function returns `null`.
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*Returns:* boolean or `null`
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[discrete]
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[[eql-fn-concat]]
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=== `concat`
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Returns a concatenated string of provided values.
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*Example*
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[source,eql]
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----
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concat("process is ", "regsvr32.exe") // returns "process is regsvr32.exe"
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concat("regsvr32.exe", " ", 42) // returns "regsvr32.exe 42"
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concat("regsvr32.exe", " ", 42.5) // returns "regsvr32.exe 42.5"
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concat("regsvr32.exe", " ", true) // returns "regsvr32.exe true"
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concat("regsvr32.exe") // returns "regsvr32.exe"
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// process.name = "regsvr32.exe"
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concat(process.name, " ", 42) // returns "regsvr32.exe 42"
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concat(process.name, " ", 42.5) // returns "regsvr32.exe 42.5"
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concat("process is ", process.name) // returns "process is regsvr32.exe"
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concat(process.name, " ", true) // returns "regsvr32.exe true"
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concat(process.name) // returns "regsvr32.exe"
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// process.arg_count = 4
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concat(process.name, " ", process.arg_count) // returns "regsvr32.exe 4"
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// null handling
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concat(null, "regsvr32.exe") // returns null
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concat(process.name, null) // returns null
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concat(null) // returns null
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----
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*Syntax*
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[source,txt]
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----
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concat(<value>[, <value>])
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----
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*Parameters*
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`<value>`::
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(Required{multi-arg-ref})
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Value to concatenate. If any of the arguments are `null`, the function returns `null`.
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+
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If using a field as the argument, this parameter does not support the
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<<text,`text`>> field data type.
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*Returns:* string or `null`
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[discrete]
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[[eql-fn-divide]]
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=== `divide`
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Returns the quotient of a provided dividend and divisor.
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[[eql-divide-fn-float-rounding]]
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[WARNING]
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====
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If both the dividend and divisor are integers, the `divide` function _rounds
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down_ any returned floating point numbers to the nearest integer. To avoid
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rounding, convert either the dividend or divisor to a float.
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[%collapsible]
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.**Example**
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=====
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The `process.args_count` field is a <<number,`long`>> integer field containing a
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count of process arguments.
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A user might expect the following EQL query to only match events with a
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`process.args_count` value of `4`.
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[source,eql]
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----
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process where divide(4, process.args_count) == 1
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----
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However, the EQL query matches events with a `process.args_count` value of `3`
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or `4`.
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For events with a `process.args_count` value of `3`, the `divide` function
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returns a floating point number of `1.333...`, which is rounded down to `1`.
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To match only events with a `process.args_count` value of `4`, convert
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either the dividend or divisor to a float.
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The following EQL query changes the integer `4` to the equivalent float `4.0`.
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[source,eql]
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----
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process where divide(4.0, process.args_count) == 1
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----
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=====
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====
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*Example*
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[source,eql]
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----
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divide(4, 2) // returns 2
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divide(4, 3) // returns 1
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divide(4, 3.0) // returns 1.333...
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divide(4, 0.5) // returns 8
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divide(0.5, 4) // returns 0.125
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divide(0.5, 0.25) // returns 2.0
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divide(4, -2) // returns -2
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divide(-4, -2) // returns 2
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// process.args_count = 4
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divide(process.args_count, 2) // returns 2
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divide(process.args_count, 3) // returns 1
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divide(process.args_count, 3.0) // returns 1.333...
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divide(12, process.args_count) // returns 3
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divide(process.args_count, 0.5) // returns 8
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divide(0.5, process.args_count) // returns 0.125
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// process.parent.args_count = 2
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divide(process.args_count, process.parent.args_count) // returns 2
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// null handling
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divide(null, 4) // returns null
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divide(4, null) // returns null
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divide(null, process.args_count) // returns null
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divide(process.args_count, null) // returns null
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----
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*Syntax*
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[source,txt]
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----
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divide(<dividend>, <divisor>)
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----
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*Parameters*
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`<dividend>`::
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(Required, integer or float or `null`)
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Dividend to divide. If `null`, the function returns `null`.
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+
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If using a field as the argument, this parameter supports only
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<<number,`numeric`>> field data types.
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`<divisor>`::
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(Required, integer or float or `null`)
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Divisor to divide by. If `null`, the function returns `null`. This value cannot
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be zero (`0`).
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+
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If using a field as the argument, this parameter supports only
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<<number,`numeric`>> field data types.
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*Returns:* integer, float, or null
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[discrete]
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[[eql-fn-endswith]]
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=== `endsWith`
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Returns `true` if a source string ends with a provided substring. Matching is
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case-sensitive.
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*Example*
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[source,eql]
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----
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endsWith("regsvr32.exe", ".exe") // returns true
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endsWith("regsvr32.exe", ".dll") // returns false
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endsWith("", "") // returns true
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// file.name = "regsvr32.exe"
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endsWith(file.name, ".exe") // returns true
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endsWith(file.name, ".dll") // returns false
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// file.extension = ".exe"
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endsWith("regsvr32.exe", file.extension) // returns true
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endsWith("ntdll.dll", file.name) // returns false
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// null handling
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endsWith("regsvr32.exe", null) // returns null
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endsWith("", null) // returns null
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endsWith(null, ".exe") // returns null
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endsWith(null, null) // returns null
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----
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*Syntax*
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[source,txt]
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----
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endsWith(<source>, <substring>)
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----
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*Parameters*
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`<source>`::
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+
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--
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(Required, string or `null`)
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Source string. If `null`, the function returns `null`.
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If using a field as the argument, this parameter supports only the following
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field data types:
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* A type in the <<keyword,`keyword`>> family
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* <<text,`text`>> field with a <<keyword,`keyword`>> sub-field
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--
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`<substring>`::
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+
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--
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(Required, string or `null`)
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Substring to search for. If `null`, the function returns `null`.
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If using a field as the argument, this parameter supports only the following
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field data types:
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* A type in the <<keyword,`keyword`>> family
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* <<text,`text`>> field with a <<keyword,`keyword`>> sub-field
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--
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*Returns:* boolean or `null`
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[discrete]
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[[eql-fn-indexof]]
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=== `indexOf`
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Returns the first position of a provided substring in a source string. Matching
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is case-sensitive.
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If an optional start position is provided, this function returns the first
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occurrence of the substring at or after the start position.
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*Example*
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[source,eql]
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----
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// url.domain = "subdomain.example.com"
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indexOf(url.domain, ".") // returns 9
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indexOf(url.domain, ".", 9) // returns 9
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indexOf(url.domain, ".", 10) // returns 17
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indexOf(url.domain, ".", -6) // returns 9
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// empty strings
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indexOf("", "") // returns 0
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indexOf(url.domain, "") // returns 0
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indexOf(url.domain, "", 9) // returns 9
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indexOf(url.domain, "", 10) // returns 10
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indexOf(url.domain, "", -6) // returns 0
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// missing substrings
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indexOf(url.domain, "z") // returns null
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indexOf(url.domain, "z", 9) // returns null
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// start position is higher than string length
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indexOf(url.domain, ".", 30) // returns null
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// null handling
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indexOf(null, ".", 9) // returns null
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indexOf(url.domain, null, 9) // returns null
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indexOf(url.domain, ".", null) // returns null
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----
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*Syntax*
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[source,txt]
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----
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indexOf(<source>, <substring>[, <start_pos>])
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----
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*Parameters*
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`<source>`::
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+
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--
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(Required, string or `null`)
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Source string. If `null`, the function returns `null`.
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If using a field as the argument, this parameter supports only the following
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field data types:
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* A type in the <<keyword,`keyword`>> family
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* <<text,`text`>> field with a <<keyword,`keyword`>> sub-field
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--
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`<substring>`::
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+
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--
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(Required, string or `null`)
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Substring to search for.
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If this argument is `null` or the `<source>` string does not contain this
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substring, the function returns `null`.
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If the `<start_pos>` is positive, empty strings (`""`) return the `<start_pos>`.
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Otherwise, empty strings return `0`.
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If using a field as the argument, this parameter supports only the following
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field data types:
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* A type in the <<keyword,`keyword`>> family
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* <<text,`text`>> field with a <<keyword,`keyword`>> sub-field
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--
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`<start_pos>`::
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+
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--
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(Optional, integer or `null`)
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Starting position for matching. The function will not return positions before
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this one. Defaults to `0`.
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Positions are zero-indexed. Negative offsets are treated as `0`.
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If this argument is `null` or higher than the length of the `<source>` string,
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the function returns `null`.
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If using a field as the argument, this parameter supports only the following
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<<number,numeric>> field data types:
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* `long`
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* `integer`
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* `short`
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* `byte`
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--
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*Returns:* integer or `null`
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[discrete]
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|
[[eql-fn-length]]
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=== `length`
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Returns the character length of a provided string, including whitespace and
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punctuation.
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*Example*
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|
[source,eql]
|
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----
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length("explorer.exe") // returns 12
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length("start explorer.exe") // returns 18
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length("") // returns 0
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length(null) // returns null
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// process.name = "regsvr32.exe"
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length(process.name) // returns 12
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----
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*Syntax*
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[source,txt]
|
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----
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length(<string>)
|
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----
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|
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*Parameters*
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`<string>`::
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+
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--
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(Required, string or `null`)
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String for which to return the character length. If `null`, the function returns
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`null`. Empty strings return `0`.
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If using a field as the argument, this parameter supports only the following
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field data types:
|
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* A type in the <<keyword,`keyword`>> family
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* <<text,`text`>> field with a <<keyword,`keyword`>> sub-field
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--
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*Returns:* integer or `null`
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[discrete]
|
|
[[eql-fn-modulo]]
|
|
=== `modulo`
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|
Returns the remainder of the division of a provided dividend and divisor.
|
|
|
|
*Example*
|
|
[source,eql]
|
|
----
|
|
modulo(10, 6) // returns 4
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modulo(10, 5) // returns 0
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|
modulo(10, 0.5) // returns 0
|
|
modulo(10, -6) // returns 4
|
|
modulo(-10, -6) // returns -4
|
|
|
|
// process.args_count = 10
|
|
modulo(process.args_count, 6) // returns 4
|
|
modulo(process.args_count, 5) // returns 0
|
|
modulo(106, process.args_count) // returns 6
|
|
modulo(process.args_count, -6) // returns 4
|
|
modulo(process.args_count, 0.5) // returns 0
|
|
|
|
// process.parent.args_count = 6
|
|
add(process.args_count, process.parent.args_count) // returns 4
|
|
|
|
// null handling
|
|
modulo(null, 5) // returns null
|
|
modulo(7, null) // returns null
|
|
modulo(null, process.args_count) // returns null
|
|
modulo(process.args_count, null) // returns null
|
|
----
|
|
|
|
*Syntax*
|
|
[source,txt]
|
|
----
|
|
modulo(<dividend>, <divisor>)
|
|
----
|
|
|
|
*Parameters*
|
|
|
|
`<dividend>`::
|
|
(Required, integer or float or `null`)
|
|
Dividend to divide. If `null`, the function returns `null`. Floating point
|
|
numbers return `0`.
|
|
+
|
|
If using a field as the argument, this parameter supports only
|
|
<<number,`numeric`>> field data types.
|
|
|
|
`<divisor>`::
|
|
(Required, integer or float or `null`)
|
|
Divisor to divide by. If `null`, the function returns `null`. Floating point
|
|
numbers return `0`. This value cannot be zero (`0`).
|
|
+
|
|
If using a field as the argument, this parameter supports only
|
|
<<number,`numeric`>> field data types.
|
|
|
|
*Returns:* integer, float, or `null`
|
|
|
|
[discrete]
|
|
[[eql-fn-multiply]]
|
|
=== `multiply`
|
|
|
|
Returns the product of two provided factors.
|
|
|
|
*Example*
|
|
[source,eql]
|
|
----
|
|
multiply(2, 2) // returns 4
|
|
multiply(0.5, 2) // returns 1
|
|
multiply(0.25, 2) // returns 0.5
|
|
multiply(-2, 2) // returns -4
|
|
multiply(-2, -2) // returns 4
|
|
|
|
// process.args_count = 2
|
|
multiply(process.args_count, 2) // returns 4
|
|
multiply(0.5, process.args_count) // returns 1
|
|
multiply(0.25, process.args_count) // returns 0.5
|
|
|
|
// process.parent.args_count = 3
|
|
multiply(process.args_count, process.parent.args_count) // returns 6
|
|
|
|
// null handling
|
|
multiply(null, 2) // returns null
|
|
multiply(2, null) // returns null
|
|
----
|
|
|
|
*Syntax*
|
|
[source,txt]
|
|
----
|
|
multiply(<factor, <factor>)
|
|
----
|
|
|
|
*Parameters*
|
|
|
|
`<factor>`::
|
|
+
|
|
--
|
|
(Required, integer or float or `null`)
|
|
Factor to multiply. If `null`, the function returns `null`.
|
|
|
|
Two factors are required. No more than two factors can be provided.
|
|
|
|
If using a field as the argument, this parameter supports only
|
|
<<number,`numeric`>> field data types.
|
|
--
|
|
|
|
*Returns:* integer, float, or `null`
|
|
|
|
[discrete]
|
|
[[eql-fn-number]]
|
|
=== `number`
|
|
|
|
Converts a string to the corresponding integer or float.
|
|
|
|
*Example*
|
|
[source,eql]
|
|
----
|
|
number("1337") // returns 1337
|
|
number("42.5") // returns 42.5
|
|
number("deadbeef", 16) // returns 3735928559
|
|
|
|
// integer literals beginning with "0x" are auto-detected as hexadecimal
|
|
number("0xdeadbeef") // returns 3735928559
|
|
number("0xdeadbeef", 16) // returns 3735928559
|
|
|
|
// "+" and "-" are supported
|
|
number("+1337") // returns 1337
|
|
number("-1337") // returns -1337
|
|
|
|
// surrounding whitespace is ignored
|
|
number(" 1337 ") // returns 1337
|
|
|
|
// process.pid = "1337"
|
|
number(process.pid) // returns 1337
|
|
|
|
// null handling
|
|
number(null) // returns null
|
|
number(null, 16) // returns null
|
|
|
|
// strings beginning with "0x" are treated as hexadecimal (base 16),
|
|
// even if the <base_num> is explicitly null.
|
|
number("0xdeadbeef", null) // returns 3735928559
|
|
|
|
// otherwise, strings are treated as decimal (base 10)
|
|
// if the <base_num> is explicitly null.
|
|
number("1337", null) // returns 1337
|
|
----
|
|
|
|
*Syntax*
|
|
[source,txt]
|
|
----
|
|
number(<string>[, <base_num>])
|
|
----
|
|
|
|
*Parameters*
|
|
|
|
`<string>`::
|
|
+
|
|
--
|
|
(Required, string or `null`)
|
|
String to convert to an integer or float. If this value is a string, it must be
|
|
one of the following:
|
|
|
|
* A string representation of an integer (e.g., `"42"`)
|
|
* A string representation of a float (e.g., `"9.5"`)
|
|
* If the `<base_num>` parameter is specified, a string containing an integer
|
|
literal in the base notation (e.g., `"0xDECAFBAD"` in hexadecimal or base
|
|
`16`)
|
|
|
|
Strings that begin with `0x` are auto-detected as hexadecimal and use a default
|
|
`<base_num>` of `16`.
|
|
|
|
`-` and `+` are supported with no space between. Surrounding whitespace is
|
|
ignored. Empty strings (`""`) are not supported.
|
|
|
|
If using a field as the argument, this parameter supports only the following
|
|
field data types:
|
|
|
|
* A type in the <<keyword,`keyword`>> family
|
|
* <<text,`text`>> field with a <<keyword,`keyword`>> sub-field
|
|
|
|
If this argument is `null`, the function returns `null`.
|
|
--
|
|
|
|
`<base_num>`::
|
|
+
|
|
--
|
|
(Optional, integer or `null`)
|
|
Radix or base used to convert the string. If the `<string>` begins with `0x`,
|
|
this parameter defaults to `16` (hexadecimal). Otherwise, it defaults to base
|
|
`10`.
|
|
|
|
If this argument is explicitly `null`, the default value is used.
|
|
|
|
Fields are not supported as arguments.
|
|
--
|
|
|
|
*Returns:* integer or float or `null`
|
|
|
|
[discrete]
|
|
[[eql-fn-startswith]]
|
|
=== `startsWith`
|
|
|
|
Returns `true` if a source string begins with a provided substring. Matching is
|
|
case-sensitive.
|
|
|
|
*Example*
|
|
[source,eql]
|
|
----
|
|
startsWith("regsvr32.exe", "regsvr32") // returns true
|
|
startsWith("regsvr32.exe", "explorer") // returns false
|
|
startsWith("", "") // returns true
|
|
|
|
// process.name = "regsvr32.exe"
|
|
startsWith(process.name, "regsvr32") // returns true
|
|
startsWith(process.name, "explorer") // returns false
|
|
|
|
// process.name = "regsvr32"
|
|
startsWith("regsvr32.exe", process.name) // returns true
|
|
startsWith("explorer.exe", process.name) // returns false
|
|
|
|
// null handling
|
|
startsWith("regsvr32.exe", null) // returns null
|
|
startsWith("", null) // returns null
|
|
startsWith(null, "regsvr32") // returns null
|
|
startsWith(null, null) // returns null
|
|
----
|
|
|
|
*Syntax*
|
|
[source,txt]
|
|
----
|
|
startsWith(<source>, <substring>)
|
|
----
|
|
|
|
*Parameters*
|
|
|
|
`<source>`::
|
|
+
|
|
--
|
|
(Required, string or `null`)
|
|
Source string. If `null`, the function returns `null`.
|
|
|
|
If using a field as the argument, this parameter supports only the following
|
|
field data types:
|
|
|
|
* A type in the <<keyword,`keyword`>> family
|
|
* <<text,`text`>> field with a <<keyword,`keyword`>> sub-field
|
|
--
|
|
|
|
`<substring>`::
|
|
+
|
|
--
|
|
(Required, string or `null`)
|
|
Substring to search for. If `null`, the function returns `null`.
|
|
|
|
If using a field as the argument, this parameter supports only the following
|
|
field data types:
|
|
|
|
* A type in the <<keyword,`keyword`>> family
|
|
* <<text,`text`>> field with a <<keyword,`keyword`>> sub-field
|
|
--
|
|
|
|
*Returns:* boolean or `null`
|
|
|
|
[discrete]
|
|
[[eql-fn-string]]
|
|
=== `string`
|
|
|
|
Converts a value to a string.
|
|
|
|
*Example*
|
|
[source,eql]
|
|
----
|
|
string(42) // returns "42"
|
|
string(42.5) // returns "42.5"
|
|
string("regsvr32.exe") // returns "regsvr32.exe"
|
|
string(true) // returns "true"
|
|
|
|
// null handling
|
|
string(null) // returns null
|
|
----
|
|
|
|
*Syntax*
|
|
[source,txt]
|
|
----
|
|
string(<value>)
|
|
----
|
|
|
|
*Parameters*
|
|
|
|
`<value>`::
|
|
(Required)
|
|
Value to convert to a string. If `null`, the function returns `null`.
|
|
+
|
|
If using a field as the argument, this parameter does not support the
|
|
<<text,`text`>> field data type.
|
|
|
|
*Returns:* string or `null`
|
|
|
|
[discrete]
|
|
[[eql-fn-stringcontains]]
|
|
=== `stringContains`
|
|
|
|
Returns `true` if a source string contains a provided substring. Matching is
|
|
case-sensitive.
|
|
|
|
*Example*
|
|
[source,eql]
|
|
----
|
|
// process.command_line = "start regsvr32.exe"
|
|
stringContains(process.command_line, "regsvr32") // returns true
|
|
stringContains(process.command_line, "start ") // returns true
|
|
stringContains(process.command_line, "explorer") // returns false
|
|
|
|
// process.name = "regsvr32.exe"
|
|
stringContains(command_line, process.name) // returns true
|
|
|
|
// empty strings
|
|
stringContains("", "") // returns false
|
|
stringContains(process.command_line, "") // returns false
|
|
|
|
// null handling
|
|
stringContains(null, "regsvr32") // returns null
|
|
stringContains(process.command_line, null) // returns null
|
|
----
|
|
|
|
*Syntax*
|
|
[source,txt]
|
|
----
|
|
stringContains(<source>, <substring>)
|
|
----
|
|
|
|
*Parameters*
|
|
|
|
`<source>`::
|
|
(Required, string or `null`)
|
|
Source string to search. If `null`, the function returns `null`.
|
|
|
|
If using a field as the argument, this parameter supports only the following
|
|
field data types:
|
|
|
|
* A type in the <<keyword,`keyword`>> family
|
|
* <<text,`text`>> field with a <<keyword,`keyword`>> sub-field
|
|
|
|
`<substring>`::
|
|
(Required, string or `null`)
|
|
Substring to search for. If `null`, the function returns `null`.
|
|
|
|
If using a field as the argument, this parameter supports only the following
|
|
field data types:
|
|
|
|
* A type in the <<keyword,`keyword`>> family
|
|
* <<text,`text`>> field with a <<keyword,`keyword`>> sub-field
|
|
|
|
*Returns:* boolean or `null`
|
|
|
|
[discrete]
|
|
[[eql-fn-substring]]
|
|
=== `substring`
|
|
|
|
Extracts a substring from a source string at provided start and end positions.
|
|
|
|
If no end position is provided, the function extracts the remaining string.
|
|
|
|
*Example*
|
|
[source,eql]
|
|
----
|
|
substring("start regsvr32.exe", 6) // returns "regsvr32.exe"
|
|
substring("start regsvr32.exe", 0, 5) // returns "start"
|
|
substring("start regsvr32.exe", 6, 14) // returns "regsvr32"
|
|
substring("start regsvr32.exe", -4) // returns ".exe"
|
|
substring("start regsvr32.exe", -4, -1) // returns ".ex"
|
|
----
|
|
|
|
*Syntax*
|
|
[source,txt]
|
|
----
|
|
substring(<source>, <start_pos>[, <end_pos>])
|
|
----
|
|
|
|
*Parameters*
|
|
|
|
`<source>`::
|
|
(Required, string)
|
|
Source string.
|
|
|
|
`<start_pos>`::
|
|
+
|
|
--
|
|
(Required, integer)
|
|
Starting position for extraction.
|
|
|
|
If this position is higher than the `<end_pos>` position or the length of the
|
|
`<source>` string, the function returns an empty string.
|
|
|
|
Positions are zero-indexed. Negative offsets are supported.
|
|
--
|
|
|
|
`<end_pos>`::
|
|
(Optional, integer)
|
|
Exclusive end position for extraction. If this position is not provided, the
|
|
function returns the remaining string.
|
|
+
|
|
Positions are zero-indexed. Negative offsets are supported.
|
|
|
|
*Returns:* string
|
|
|
|
[discrete]
|
|
[[eql-fn-subtract]]
|
|
=== `subtract`
|
|
Returns the difference between a provided minuend and subtrahend.
|
|
|
|
*Example*
|
|
[source,eql]
|
|
----
|
|
subtract(10, 2) // returns 8
|
|
subtract(10.5, 0.5) // returns 10
|
|
subtract(1, 0.2) // returns 0.8
|
|
subtract(-2, 4) // returns -8
|
|
subtract(-2, -4) // returns 8
|
|
|
|
// process.args_count = 10
|
|
subtract(process.args_count, 6) // returns 4
|
|
subtract(process.args_count, 5) // returns 5
|
|
subtract(15, process.args_count) // returns 5
|
|
subtract(process.args_count, 0.5) // returns 9.5
|
|
|
|
// process.parent.args_count = 6
|
|
subtract(process.args_count, process.parent.args_count) // returns 4
|
|
|
|
// null handling
|
|
subtract(null, 2) // returns null
|
|
subtract(2, null) // returns null
|
|
----
|
|
|
|
*Syntax*
|
|
[source,txt]
|
|
----
|
|
subtract(<minuend>, <subtrahend>)
|
|
----
|
|
|
|
*Parameters*
|
|
|
|
`<minuend>`::
|
|
(Required, integer or float or `null`)
|
|
Minuend to subtract from.
|
|
+
|
|
If using a field as the argument, this parameter supports only
|
|
<<number,`numeric`>> field data types.
|
|
|
|
`<subtrahend>`::
|
|
(Optional, integer or float or `null`)
|
|
Subtrahend to subtract. If `null`, the function returns `null`.
|
|
+
|
|
If using a field as the argument, this parameter supports only
|
|
<<number,`numeric`>> field data types.
|
|
|
|
*Returns:* integer, float, or `null`
|
|
|
|
[discrete]
|
|
[[eql-fn-wildcard]]
|
|
=== `wildcard`
|
|
|
|
Returns `true` if a source string matches one or more provided wildcard
|
|
expressions. Matching is case-sensitive.
|
|
|
|
*Example*
|
|
[source,eql]
|
|
----
|
|
// The two following expressions are equivalent.
|
|
process.name == "*regsvr32*" or process.name == "*explorer*"
|
|
wildcard(process.name, "*regsvr32*", "*explorer*")
|
|
|
|
// process.name = "regsvr32.exe"
|
|
wildcard(process.name, "*regsvr32*") // returns true
|
|
wildcard(process.name, "*regsvr32*", "*explorer*") // returns true
|
|
wildcard(process.name, "*explorer*") // returns false
|
|
wildcard(process.name, "*explorer*", "*scrobj*") // returns false
|
|
|
|
// empty strings
|
|
wildcard("", "*start*") // returns false
|
|
wildcard("", "*") // returns true
|
|
wildcard("", "") // returns true
|
|
|
|
// null handling
|
|
wildcard(null, "*regsvr32*") // returns null
|
|
wildcard(process.name, null) // returns null
|
|
----
|
|
|
|
*Syntax*
|
|
[source,txt]
|
|
----
|
|
wildcard(<source>, <wildcard_exp>[, ...])
|
|
----
|
|
|
|
*Parameters*
|
|
|
|
`<source>`::
|
|
+
|
|
--
|
|
(Required, string)
|
|
Source string. If `null`, the function returns `null`.
|
|
|
|
If using a field as the argument, this parameter supports only the following
|
|
field data types:
|
|
|
|
* A type in the <<keyword,`keyword`>> family
|
|
* <<text,`text`>> field with a <<keyword,`keyword`>> sub-field
|
|
--
|
|
|
|
`<wildcard_exp>`::
|
|
+
|
|
--
|
|
(Required{multi-arg-ref}, string)
|
|
Wildcard expression used to match the source string. If `null`, the function
|
|
returns `null`. Fields are not supported as arguments.
|
|
--
|
|
|
|
*Returns:* boolean
|