[DOCS] Rewrite `regexp` query (#42711)
This commit is contained in:
James Rodewig
parent
bfb2e323e9
commit
ad7c164dd0
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@ -205,6 +205,7 @@ specific index module:
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The maximum number of terms that can be used in Terms Query.
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Defaults to `65536`.
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[[index-max-regex-length]]
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`index.max_regex_length`::
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The maximum length of regex that can be used in Regexp Query.
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@ -47,4 +47,6 @@ include::query-dsl/term-level-queries.asciidoc[]
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include::query-dsl/minimum-should-match.asciidoc[]
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include::query-dsl/multi-term-rewrite.asciidoc[]
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include::query-dsl/multi-term-rewrite.asciidoc[]
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include::query-dsl/regexp-syntax.asciidoc[]
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@ -4,98 +4,86 @@
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<titleabbrev>Regexp</titleabbrev>
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++++
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The `regexp` query allows you to use regular expression term queries.
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See <<regexp-syntax>> for details of the supported regular expression language.
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The "term queries" in that first sentence means that Elasticsearch will apply
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the regexp to the terms produced by the tokenizer for that field, and not
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to the original text of the field.
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Returns documents that contain terms matching a
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https://en.wikipedia.org/wiki/Regular_expression[regular expression].
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*Note*: The performance of a `regexp` query heavily depends on the
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regular expression chosen. Matching everything like `.*` is very slow as
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well as using lookaround regular expressions. If possible, you should
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try to use a long prefix before your regular expression starts. Wildcard
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matchers like `.*?+` will mostly lower performance.
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A regular expression is a way to match patterns in data using placeholder
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characters, called operators. For a list of operators supported by the
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`regexp` query, see <<regexp-syntax, Regular expression syntax>>.
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[[regexp-query-ex-request]]
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==== Example request
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The following search returns documents where the `user` field contains any term
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that begins with `k` and ends with `y`. The `.*` operators match any
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characters of any length, including no characters. Matching
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terms can include `ky`, `kay`, and `kimchy`.
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[source,js]
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--------------------------------------------------
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----
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GET /_search
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{
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"query": {
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"regexp":{
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"name.first": "s.*y"
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}
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}
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}
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--------------------------------------------------
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// CONSOLE
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Boosting is also supported
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[source,js]
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--------------------------------------------------
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GET /_search
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{
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"query": {
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"regexp":{
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"name.first":{
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"value":"s.*y",
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"boost":1.2
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"regexp": {
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"user": {
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"value": "k.*y",
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"flags" : "ALL",
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"max_determinized_states": 10000,
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"rewrite": "constant_score"
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}
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}
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}
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}
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--------------------------------------------------
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----
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// CONSOLE
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You can also use special flags
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[source,js]
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--------------------------------------------------
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GET /_search
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{
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"query": {
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"regexp":{
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"name.first": {
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"value": "s.*y",
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"flags" : "INTERSECTION|COMPLEMENT|EMPTY"
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}
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}
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}
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}
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--------------------------------------------------
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// CONSOLE
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[[regexp-top-level-params]]
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==== Top-level parameters for `regexp`
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`<field>`::
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(Required, object) Field you wish to search.
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Possible flags are `ALL` (default), `ANYSTRING`, `COMPLEMENT`,
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`EMPTY`, `INTERSECTION`, `INTERVAL`, or `NONE`. Please check the
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http://lucene.apache.org/core/4_9_0/core/org/apache/lucene/util/automaton/RegExp.html[Lucene
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documentation] for their meaning
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[[regexp-query-field-params]]
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==== Parameters for `<field>`
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`value`::
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(Required, string) Regular expression for terms you wish to find in the provided
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`<field>`. For a list of supported operators, see <<regexp-syntax, Regular
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expression syntax>>.
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+
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--
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By default, regular expressions are limited to 1,000 characters. You can change
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this limit using the <<index-max-regex-length, `index.max_regex_length`>>
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setting.
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Regular expressions are dangerous because it's easy to accidentally
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create an innocuous looking one that requires an exponential number of
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internal determinized automaton states (and corresponding RAM and CPU)
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for Lucene to execute. Lucene prevents these using the
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`max_determinized_states` setting (defaults to 10000). You can raise
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this limit to allow more complex regular expressions to execute.
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[WARNING]
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=====
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The performance of the `regexp` query can vary based on the regular expression
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provided. To improve performance, avoid using wildcard patterns, such as `.*` or
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`.*?+`, without a prefix or suffix.
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=====
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--
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[source,js]
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--------------------------------------------------
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GET /_search
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{
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"query": {
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"regexp":{
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"name.first": {
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"value": "s.*y",
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"flags" : "INTERSECTION|COMPLEMENT|EMPTY",
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"max_determinized_states": 20000
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}
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}
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}
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}
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--------------------------------------------------
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// CONSOLE
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`flags`::
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(Optional, string) Enables optional operators for the regular expression. For
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valid values and more information, see <<regexp-optional-operators, Regular
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expression syntax>>.
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NOTE: By default the maximum length of regex string allowed in a Regexp Query
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is limited to 1000. You can update the `index.max_regex_length` index setting
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to bypass this limit.
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`max_determinized_states`::
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+
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--
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(Optional, integer) Maximum number of
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https://en.wikipedia.org/wiki/Deterministic_finite_automaton[automaton states]
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required for the query. Default is `10000`.
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include::regexp-syntax.asciidoc[]
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{es} uses https://lucene.apache.org/core/[Apache Lucene] internally to parse
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regular expressions. Lucene converts each regular expression to a finite
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automaton containing a number of determinized states.
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You can use this parameter to prevent that conversion from unintentionally
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consuming too many resources. You may need to increase this limit to run complex
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regular expressions.
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--
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`rewrite`::
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(Optional, string) Method used to rewrite the query. For valid values and more
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information, see the <<query-dsl-multi-term-rewrite, `rewrite` parameter>>.
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@ -1,286 +1,224 @@
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[[regexp-syntax]]
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==== Regular expression syntax
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== Regular expression syntax
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Regular expression queries are supported by the `regexp` and the `query_string`
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queries. The Lucene regular expression engine
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is not Perl-compatible but supports a smaller range of operators.
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A https://en.wikipedia.org/wiki/Regular_expression[regular expression] is a way to
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match patterns in data using placeholder characters, called operators.
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[NOTE]
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=====
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We will not attempt to explain regular expressions, but
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just explain the supported operators.
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=====
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{es} supports regular expressions in the following queries:
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===== Standard operators
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* <<query-dsl-regexp-query, `regexp`>>
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* <<query-dsl-query-string-query, `query_string`>>
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Anchoring::
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+
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--
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{es} uses https://lucene.apache.org/core/[Apache Lucene]'s regular expression
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engine to parse these queries.
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Most regular expression engines allow you to match any part of a string.
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If you want the regexp pattern to start at the beginning of the string or
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finish at the end of the string, then you have to _anchor_ it specifically,
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using `^` to indicate the beginning or `$` to indicate the end.
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Lucene's patterns are always anchored. The pattern provided must match
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the entire string. For string `"abcde"`:
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ab.* # match
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abcd # no match
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--
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Allowed characters::
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+
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--
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Any Unicode characters may be used in the pattern, but certain characters
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are reserved and must be escaped. The standard reserved characters are:
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[float]
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[[regexp-reserved-characters]]
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=== Reserved characters
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Lucene's regular expression engine supports all Unicode characters. However, the
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following characters are reserved as operators:
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....
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. ? + * | { } [ ] ( ) " \
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....
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If you enable optional features (see below) then these characters may
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also be reserved:
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Depending on the <<regexp-optional-operators, optional operators>> enabled, the
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following characters may also be reserved:
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# @ & < > ~
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....
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# @ & < > ~
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....
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Any reserved character can be escaped with a backslash `"\*"` including
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a literal backslash character: `"\\"`
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To use one of these characters literally, escape it with a preceding
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backslash or surround it with double quotes. For example:
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Additionally, any characters (except double quotes) are interpreted literally
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when surrounded by double quotes:
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....
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\@ # renders as a literal '@'
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\\ # renders as a literal '\'
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"john@smith.com" # renders as 'john@smith.com'
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....
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john"@smith.com"
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[float]
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[[regexp-standard-operators]]
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=== Standard operators
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Lucene's regular expression engine does not use the
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https://en.wikipedia.org/wiki/Perl_Compatible_Regular_Expressions[Perl
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Compatible Regular Expressions (PCRE)] library, but it does support the
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following standard operators.
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--
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Match any character::
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`.`::
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+
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--
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Matches any character. For example:
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The period `"."` can be used to represent any character. For string `"abcde"`:
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ab... # match
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a.c.e # match
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....
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ab. # matches 'aba', 'abb', 'abz', etc.
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....
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--
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One-or-more::
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`?`::
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+
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--
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Repeat the preceding character zero or one times. Often used to make the
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preceding character optional. For example:
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The plus sign `"+"` can be used to repeat the preceding shortest pattern
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once or more times. For string `"aaabbb"`:
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a+b+ # match
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aa+bb+ # match
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a+.+ # match
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aa+bbb+ # match
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....
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abc? # matches 'ab' and 'abc'
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....
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--
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Zero-or-more::
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`+`::
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+
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--
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Repeat the preceding character one or more times. For example:
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The asterisk `"*"` can be used to match the preceding shortest pattern
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zero-or-more times. For string `"aaabbb`":
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a*b* # match
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a*b*c* # match
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.*bbb.* # match
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aaa*bbb* # match
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....
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ab+ # matches 'abb', 'abbb', 'abbbb', etc.
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....
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--
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Zero-or-one::
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`*`::
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+
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--
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Repeat the preceding character zero or more times. For example:
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The question mark `"?"` makes the preceding shortest pattern optional. It
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matches zero or one times. For string `"aaabbb"`:
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aaa?bbb? # match
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aaaa?bbbb? # match
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.....?.? # match
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aa?bb? # no match
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....
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ab* # matches 'ab', 'abb', 'abbb', 'abbbb', etc.
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....
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--
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Min-to-max::
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`{}`::
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+
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--
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Minimum and maximum number of times the preceding character can repeat. For
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example:
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Curly brackets `"{}"` can be used to specify a minimum and (optionally)
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a maximum number of times the preceding shortest pattern can repeat. The
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allowed forms are:
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{5} # repeat exactly 5 times
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{2,5} # repeat at least twice and at most 5 times
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{2,} # repeat at least twice
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For string `"aaabbb"`:
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a{3}b{3} # match
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a{2,4}b{2,4} # match
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a{2,}b{2,} # match
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.{3}.{3} # match
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a{4}b{4} # no match
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a{4,6}b{4,6} # no match
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a{4,}b{4,} # no match
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....
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a{2} # matches 'aa'
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a{2,4} # matches 'aa', 'aaa', and 'aaaa'
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a{2,} # matches 'a` repeated two or more times
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....
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--
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Grouping::
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`|`::
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+
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--
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Parentheses `"()"` can be used to form sub-patterns. The quantity operators
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listed above operate on the shortest previous pattern, which can be a group.
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For string `"ababab"`:
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(ab)+ # match
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ab(ab)+ # match
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(..)+ # match
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(...)+ # no match
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(ab)* # match
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abab(ab)? # match
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ab(ab)? # no match
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(ab){3} # match
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(ab){1,2} # no match
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OR operator. The match will succeed if the longest pattern on either the left
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side OR the right side matches. For example:
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....
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abc|xyz # matches 'abc' and 'xyz'
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....
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--
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Alternation::
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`( … )`::
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+
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--
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Forms a group. You can use a group to treat part of the expression as a single
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character. For example:
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The pipe symbol `"|"` acts as an OR operator. The match will succeed if
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the pattern on either the left-hand side OR the right-hand side matches.
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The alternation applies to the _longest pattern_, not the shortest.
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For string `"aabb"`:
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aabb|bbaa # match
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aacc|bb # no match
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aa(cc|bb) # match
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a+|b+ # no match
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a+b+|b+a+ # match
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a+(b|c)+ # match
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....
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abc(def)? # matches 'abc' and 'abcdef' but not 'abcd'
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....
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--
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Character classes::
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`[ … ]`::
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+
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--
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Match one of the characters in the brackets. For example:
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Ranges of potential characters may be represented as character classes
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by enclosing them in square brackets `"[]"`. A leading `^`
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negates the character class. The allowed forms are:
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....
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[abc] # matches 'a', 'b', 'c'
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....
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[abc] # 'a' or 'b' or 'c'
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[a-c] # 'a' or 'b' or 'c'
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[-abc] # '-' or 'a' or 'b' or 'c'
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[abc\-] # '-' or 'a' or 'b' or 'c'
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[^abc] # any character except 'a' or 'b' or 'c'
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[^a-c] # any character except 'a' or 'b' or 'c'
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[^-abc] # any character except '-' or 'a' or 'b' or 'c'
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[^abc\-] # any character except '-' or 'a' or 'b' or 'c'
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Inside the brackets, `-` indicates a range unless `-` is the first character or
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escaped. For example:
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Note that the dash `"-"` indicates a range of characters, unless it is
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the first character or if it is escaped with a backslash.
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....
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[a-c] # matches 'a', 'b', or 'c'
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[-abc] # '-' is first character. Matches '-', 'a', 'b', or 'c'
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[abc\-] # Escapes '-'. Matches 'a', 'b', 'c', or '-'
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....
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For string `"abcd"`:
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ab[cd]+ # match
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[a-d]+ # match
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[^a-d]+ # no match
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A `^` before a character in the brackets negates the character or range. For
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example:
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....
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[^abc] # matches any character except 'a', 'b', or 'c'
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[^a-c] # matches any character except 'a', 'b', or 'c'
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[^-abc] # matches any character except '-', 'a', 'b', or 'c'
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[^abc\-] # matches any character except 'a', 'b', 'c', or '-'
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....
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--
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===== Optional operators
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[float]
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[[regexp-optional-operators]]
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=== Optional operators
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These operators are available by default as the `flags` parameter defaults to `ALL`.
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Different flag combinations (concatenated with `"|"`) can be used to enable/disable
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specific operators:
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You can use the `flags` parameter to enable more optional operators for
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Lucene's regular expression engine.
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{
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"regexp": {
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"username": {
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"value": "john~athon<1-5>",
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"flags": "COMPLEMENT|INTERVAL"
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}
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}
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}
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To enable multiple operators, use a `|` separator. For example, a `flags` value
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of `COMPLEMENT|INTERVAL` enables the `COMPLEMENT` and `INTERVAL` operators.
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Complement::
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[float]
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==== Valid values
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`ALL` (Default)::
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Enables all optional operators.
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`COMPLEMENT`::
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+
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--
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Enables the `~` operator. You can use `~` to negate the shortest following
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pattern. For example:
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The complement is probably the most useful option. The shortest pattern that
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follows a tilde `"~"` is negated. For instance, `"ab~cd" means:
|
||||
|
||||
* Starts with `a`
|
||||
* Followed by `b`
|
||||
* Followed by a string of any length that is anything but `c`
|
||||
* Ends with `d`
|
||||
|
||||
For the string `"abcdef"`:
|
||||
|
||||
ab~df # match
|
||||
ab~cf # match
|
||||
ab~cdef # no match
|
||||
a~(cb)def # match
|
||||
a~(bc)def # no match
|
||||
|
||||
Enabled with the `COMPLEMENT` or `ALL` flags.
|
||||
|
||||
....
|
||||
a~bc # matches 'adc' and 'aec' but not 'abc'
|
||||
....
|
||||
--
|
||||
|
||||
Interval::
|
||||
`INTERVAL`::
|
||||
+
|
||||
--
|
||||
Enables the `<>` operators. You can use `<>` to match a numeric range. For
|
||||
example:
|
||||
|
||||
The interval option enables the use of numeric ranges, enclosed by angle
|
||||
brackets `"<>"`. For string: `"foo80"`:
|
||||
|
||||
foo<1-100> # match
|
||||
foo<01-100> # match
|
||||
foo<001-100> # no match
|
||||
|
||||
Enabled with the `INTERVAL` or `ALL` flags.
|
||||
|
||||
|
||||
....
|
||||
foo<1-100> # matches 'foo1', 'foo2' ... 'foo99', 'foo100'
|
||||
foo<01-100> # matches 'foo01', 'foo02' ... 'foo99', 'foo100'
|
||||
....
|
||||
--
|
||||
|
||||
Intersection::
|
||||
`INTERSECTION`::
|
||||
+
|
||||
--
|
||||
Enables the `&` operator, which acts as an AND operator. The match will succeed
|
||||
if patterns on both the left side AND the right side matches. For example:
|
||||
|
||||
The ampersand `"&"` joins two patterns in a way that both of them have to
|
||||
match. For string `"aaabbb"`:
|
||||
|
||||
aaa.+&.+bbb # match
|
||||
aaa&bbb # no match
|
||||
|
||||
Using this feature usually means that you should rewrite your regular
|
||||
expression.
|
||||
|
||||
Enabled with the `INTERSECTION` or `ALL` flags.
|
||||
|
||||
....
|
||||
aaa.+&.+bbb # matches 'aaabbb'
|
||||
....
|
||||
--
|
||||
|
||||
Any string::
|
||||
`ANYSTRING`::
|
||||
+
|
||||
--
|
||||
Enables the `@` operator. You can use `@` to match any entire
|
||||
string.
|
||||
|
||||
The at sign `"@"` matches any string in its entirety. This could be combined
|
||||
with the intersection and complement above to express ``everything except''.
|
||||
For instance:
|
||||
You can combine the `@` operator with `&` and `~` operators to create an
|
||||
"everything except" logic. For example:
|
||||
|
||||
@&~(foo.+) # anything except string beginning with "foo"
|
||||
|
||||
Enabled with the `ANYSTRING` or `ALL` flags.
|
||||
....
|
||||
@&~(abc.+) # matches everything except terms beginning with 'abc'
|
||||
....
|
||||
--
|
||||
|
||||
[float]
|
||||
[[regexp-unsupported-operators]]
|
||||
=== Unsupported operators
|
||||
Lucene's regular expression engine does not support anchor operators, such as
|
||||
`^` (beginning of line) or `$` (end of line). To match a term, the regular
|
||||
expression must match the entire string.
|
||||
|
|
@ -49,7 +49,7 @@ The value specified in the field rule can be one of the following types:
|
|||
| Simple String | Exactly matches the provided value. | "esadmin"
|
||||
| Wildcard String | Matches the provided value using a wildcard. | "*,dc=example,dc=com"
|
||||
| Regular Expression | Matches the provided value using a
|
||||
{ref}/query-dsl-regexp-query.html#regexp-syntax[Lucene regexp]. | "/.\*-admin[0-9]*/"
|
||||
{ref}/regexp-syntax.html[Lucene regexp]. | "/.\*-admin[0-9]*/"
|
||||
| Number | Matches an equivalent numerical value. | 7
|
||||
| Null | Matches a null or missing value. | null
|
||||
| Array | Tests each element in the array in
|
||||
|
|
|
|||
|
|
@ -132,7 +132,7 @@ Please take time to review these policies whenever your system architecture chan
|
|||
|
||||
A policy is a named set of filter rules. Each filter rule applies to a single event attribute,
|
||||
one of the `users`, `realms`, `roles` or `indices` attributes. The filter rule defines
|
||||
a list of {ref}/query-dsl-regexp-query.html#regexp-syntax[Lucene regexp], *any* of which has to match the value of the audit
|
||||
a list of {ref}/regexp-syntax.html[Lucene regexp], *any* of which has to match the value of the audit
|
||||
event attribute for the rule to match.
|
||||
A policy matches an event if *all* the rules comprising it match the event.
|
||||
An audit event is ignored, therefore not printed, if it matches *any* policy. All other
|
||||
|
|
|
|||
Loading…
Reference in New Issue