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Elastic Docs ›Elasticsearch Guide [7.2] ›Analysis ›Token Filters

Pattern Replace Token Filter

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Pattern Replace Token Filter

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The pattern_replace token filter allows to easily handle string replacements based on a regular expression. The regular expression is defined using the pattern parameter, and the replacement string can be provided using the replacement parameter (supporting referencing the original text, as explained here).

Beware of Pathological Regular Expressions

The pattern replace token filter uses Java Regular Expressions.

A badly written regular expression could run very slowly or even throw a StackOverflowError and cause the node it is running on to exit suddenly.

Read more about pathological regular expressions and how to avoid them.

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