mention PCRE in docs/userguide
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@ -739,8 +739,9 @@ con_id::
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Compares the i3-internal container ID, which you can get via the IPC
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interface. Handy for scripting.
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Note that currently all criteria are compared case-insensitive and do not
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support regular expressions. This is planned to change in the future.
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The criteria +class+, +instance+, +title+ and +mark+ are actually regular
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expressions (PCRE). See +pcresyntax(3)+ or +perldoc perlre+ for information on
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how to use them.
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=== Splitting containers
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