[regex-coach] Please implement variable length look-behind functionality

[Alex Grässer]

Hi Edmund

Thank you very much for Regex Coach. It has helped tremendously!
Recently I needed to use a negative look-behind with multiple exclusions and
found that Regex Coach does not support variable length look-behind.

\\[^\\]*(?<!(tmp|files))$

gives an error that "Variable length look-behind not implemented (yet)"

whereas

\\[^\\]*(?<!(tmp|les))$

works, except that it excludes more than required.

Interestingly WinMerge also has this restriction ;-)

Thanks
Alex
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