55 lines
1.5 KiB
Plaintext
55 lines
1.5 KiB
Plaintext
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[[query-dsl-regexp-query]]
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=== Regexp Query
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The `regexp` query allows you to use regular expression term queries.
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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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[source,js]
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--------------------------------------------------
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{
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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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Boosting is also supported
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[source,js]
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--------------------------------------------------
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{
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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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}
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}
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}
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--------------------------------------------------
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You can also use special flags
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[source,js]
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--------------------------------------------------
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{
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"regexp":{
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"name.first": "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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Possible flags are `ALL`, `ANYSTRING`, `AUTOMATON`, `COMPLEMENT`,
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`EMPTY`, `INTERSECTION`, `INTERVAL`, or `NONE`. Please check the
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http://lucene.apache.org/core/4_3_0/core/index.html?org%2Fapache%2Flucene%2Futil%2Fautomaton%2FRegExp.html[Lucene
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documentation] for their meaning
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For more information see the
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http://lucene.apache.org/core/4_3_0/core/index.html?org%2Fapache%2Flucene%2Fsearch%2FRegexpQuery.html[Lucene
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RegexpQuery documentation].
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