Regular Expressions
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## Regular Expressions

Most of the core code has been rewritten to use `java.util.regex` instead of `gnu.regexp`, so be sure to keep that in mind as you are composing your own regular expressions, whether they are in mode files, search expressions, or in your own plugins. XSearch plugin and others still use `gnu.regexp` plugin, which offers the legacy regex engine, in case the old behavior is still desired.

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