106 lines
2.5 KiB
Plaintext
106 lines
2.5 KiB
Plaintext
[[analysis-simplepattern-tokenizer]]
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=== Simple Pattern Tokenizer
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experimental[This functionality is marked as experimental in Lucene]
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The `simple_pattern` tokenizer uses a regular expression to capture matching
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text as terms. The set of regular expression features it supports is more
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limited than the <<analysis-pattern-tokenizer,`pattern`>> tokenizer, but the
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tokenization is generally faster.
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This tokenizer does not support splitting the input on a pattern match, unlike
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the <<analysis-pattern-tokenizer,`pattern`>> tokenizer. To split on pattern
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matches using the same restricted regular expression subset, see the
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<<analysis-simplepatternsplit-tokenizer,`simple_pattern_split`>> tokenizer.
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This tokenizer uses {lucene-core-javadoc}/org/apache/lucene/util/automaton/RegExp.html[Lucene regular expressions].
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For an explanation of the supported features and syntax, see <<regexp-syntax,Regular Expression Syntax>>.
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The default pattern is the empty string, which produces no terms. This
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tokenizer should always be configured with a non-default pattern.
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[float]
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=== Configuration
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The `simple_pattern` tokenizer accepts the following parameters:
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[horizontal]
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`pattern`::
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{lucene-core-javadoc}/org/apache/lucene/util/automaton/RegExp.html[Lucene regular expression], defaults to the empty string.
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[float]
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=== Example configuration
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This example configures the `simple_pattern` tokenizer to produce terms that are
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three-digit numbers
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[source,js]
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----------------------------
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PUT my_index
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{
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"settings": {
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"analysis": {
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"analyzer": {
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"my_analyzer": {
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"tokenizer": "my_tokenizer"
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}
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},
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"tokenizer": {
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"my_tokenizer": {
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"type": "simple_pattern",
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"pattern": "[0123456789]{3}"
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}
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}
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}
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}
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}
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POST my_index/_analyze
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{
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"analyzer": "my_analyzer",
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"text": "fd-786-335-514-x"
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}
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----------------------------
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// CONSOLE
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/////////////////////
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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" : "786",
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"start_offset" : 3,
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"end_offset" : 6,
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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" : "335",
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"start_offset" : 7,
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"end_offset" : 10,
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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" : "514",
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"start_offset" : 11,
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"end_offset" : 14,
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"type" : "word",
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"position" : 2
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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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/////////////////////
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The above example produces these terms:
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[source,text]
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---------------------------
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[ 786, 335, 514 ]
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---------------------------
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