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https://issues.apache.org/jira/browse/LUCENE-10430?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17501341#comment-17501341
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Robert Muir commented on LUCENE-10430:
--------------------------------------
This is a meta character. See grammar in the documentation:
https://lucene.apache.org/core/9_0_0/core/org/apache/lucene/util/automaton/RegExp.html
{noformat}
simpleexp ::=
...
| " <Unicode string without double-quotes> " (a string)
{noformat}
> Literal double quotes cause exception in class RegExp
> -----------------------------------------------------
>
> Key: LUCENE-10430
> URL: https://issues.apache.org/jira/browse/LUCENE-10430
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/other
> Affects Versions: 9.0
> Reporter: Holger Rehn
> Priority: Major
>
> Class org.apache.lucene.util.automaton.RegExp fails to parse valid regular
> expressions that contain double quotes (except in character classes). This of
> course affects corresponding RegexpQuerys, as well.
> Example:
> {code:java}
> Query q = new RegexpQuery( new Term( "field", "a\"b" ) );
> RegExp r = new RegExp( "a\"b" );{code}
> Both fail with:
> {code:java}
> java.lang.IllegalArgumentException: expected '"' at position 3
> at
> org.apache.lucene.util.automaton.RegExp.parseSimpleExp(RegExp.java:1299)
> at
> org.apache.lucene.util.automaton.RegExp.parseCharClassExp(RegExp.java:1229)
> at org.apache.lucene.util.automaton.RegExp.parseComplExp(RegExp.java:1218)
> at
> org.apache.lucene.util.automaton.RegExp.parseRepeatExp(RegExp.java:1192)
> at
> org.apache.lucene.util.automaton.RegExp.parseConcatExp(RegExp.java:1185)
> at
> org.apache.lucene.util.automaton.RegExp.parseConcatExp(RegExp.java:1187)
> at org.apache.lucene.util.automaton.RegExp.parseInterExp(RegExp.java:1179)
> at org.apache.lucene.util.automaton.RegExp.parseUnionExp(RegExp.java:1173)
> at org.apache.lucene.util.automaton.RegExp.<init>(RegExp.java:496)
> ...{code}
> As a workaround we currently replace all double quotes with a dot.
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