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=== Char Group Tokenizer
The `char_group` tokenizer breaks text into terms whenever it encounters
a
character which is in a defined set. It is mostly useful for cases where
a simple
custom tokenization is desired, and the overhead of use of the
<<analysis-pattern-tokenizer, `pattern` tokenizer>>
is not acceptable.
=== Configuration
The `char_group` tokenizer accepts one parameter:
`tokenize_on_chars`::
A string containing a list of characters to tokenize the string on.
Whenever a character
from this list is encountered, a new token is started. Also supports
escaped values like `\\n` and `\\f`,
and in addition `\\s` to represent whitespace, `\\d` to represent
digits and `\\w` to represent letters.
Defaults to an empty list.
=== Example output
```The 2 QUICK Brown-Foxes jumped over the lazy dog's bone for $2```
When the configuration `\\s-:<>` is used for `tokenize_on_chars`, the
above sentence would produce the following terms:
```[ The, 2, QUICK, Brown, Foxes, jumped, over, the, lazy, dog's, bone,
for, $2 ]```
81 lines
1.6 KiB
Plaintext
81 lines
1.6 KiB
Plaintext
[[analysis-chargroup-tokenizer]]
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=== Char Group Tokenizer
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The `char_group` tokenizer breaks text into terms whenever it encounters a
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character which is in a defined set. It is mostly useful for cases where a simple
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custom tokenization is desired, and the overhead of use of the <<analysis-pattern-tokenizer, `pattern` tokenizer>>
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is not acceptable.
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[float]
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=== Configuration
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The `char_group` tokenizer accepts one parameter:
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[horizontal]
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`tokenize_on_chars`::
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A list containing a list of characters to tokenize the string on. Whenever a character
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from this list is encountered, a new token is started. This accepts either single
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characters like eg. `-`, or character groups: `whitespace`, `letter`, `digit`,
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`punctuation`, `symbol`.
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[float]
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=== Example output
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[source,js]
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---------------------------
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POST _analyze
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{
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"tokenizer": {
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"type": "char_group",
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"tokenize_on_chars": [
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"whitespace",
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"-",
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"\n"
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]
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},
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"text": "The QUICK brown-fox"
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}
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---------------------------
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// CONSOLE
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returns
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[source,js]
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---------------------------
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{
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"tokens": [
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{
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"token": "The",
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"start_offset": 0,
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"end_offset": 3,
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"type": "word",
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"position": 0
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},
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{
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"token": "QUICK",
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"start_offset": 4,
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"end_offset": 9,
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"type": "word",
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"position": 1
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},
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{
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"token": "brown",
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"start_offset": 10,
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"end_offset": 15,
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"type": "word",
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"position": 2
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},
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{
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"token": "fox",
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"start_offset": 16,
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"end_offset": 19,
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"type": "word",
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"position": 3
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}
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]
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}
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---------------------------
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// TESTRESPONSE
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