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You can use complex regular expressions in filter patterns. Use the following format for a regular expression:
<<regEx>>
For example, the following filter pattern contains a regular expression that finds AutoCAD temporary files (atmp files):
<<^.*\\atmp[0-9]{4,}$>>
Using the following regular expression in an exclusion pattern excludes any path containing a folder XX that also contains a child folder YY:
<<^.*\\XX\\YY(\\.*$|$)>>
The following files and folders MATCH the above expression:
\projects\xx\yy
\accounting\projects\xx\yy\file.txt
\accounting\projects\xx\yy\zz\file.txt
The following files and folders DO NOT MATCH the above expression:
\projects\accounting\file.txt
\projects\xx\y
\projects\xx\yyy\file.txt
\accounting\projects\xx\file.txt
\accounting\projects\yy\xx\zz\file.txt
A good reference on regular expressions can be found here: http://www.regular-expressions.info/reference.html