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[[analysis-pattern-replace-charfilter]]
=== Pattern Replace Char Filter
The `pattern_replace` char filter allows the use of a regex to
manipulate the characters in a string before analysis. 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
http://docs.oracle.com/javase/6/docs/api/java/util/regex/Matcher.html#appendReplacement(java.lang.StringBuffer,%20java.lang.String)[here]).
For more information check the
http://lucene.apache.org/core/4_3_1/analyzers-common/org/apache/lucene/analysis/pattern/PatternReplaceCharFilter.html[lucene
documentation]
Here is a sample configuration:
[source,js]
--------------------------------------------------
{
"index" : {
"analysis" : {
"char_filter" : {
"my_pattern":{
"type":"pattern_replace",
"pattern":"sample(.*)",
"replacement":"replacedSample $1"
}
},
"analyzer" : {
"custom_with_char_filter" : {
"tokenizer" : "standard",
"char_filter" : ["my_pattern"]
},
}
}
}
}
--------------------------------------------------
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