Hi, On Thu, Jun 25, 2009 at 2:17 PM, Alex Grässer<pyropunk51@gmail.com> wrote:
Thank you very much for Regex Coach. It has helped tremendously!
You're welcome... :)
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 ;-)
Most regex engines have this restriction. In fact, I don't know any offhand that don't. (But I'm not an expert.) Having said that, I don't have plans to implement variable-length look-behind anytime soon. Sorry if the "yet" part seems to imply otherwise. Cheers, Edi.