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

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