Making Regular Expression more efficient...

Need variable width negative lookbehind replacement...

strange behavior in vim with negative look-behind...

Stop matching when meeting a sequence of chars: fixing a lookbehind...

Regex negative look-behind in hgignore file...

negative lookbefore for a blackslash in ruby 1.9...

A regex problem I can't figure out (negative lookbehind)...

How do I match part of a string only if it is not preceded by certain characters?...