From: Rick Bradley <rick@...>
Date: 2002-05-08T02:18:16+09:00
Subject: Re: RegExp zero-width negative lookahead

* Lars Christensen (larsch@cs.auc.dk) [020507 12:12]:
> My current work-around is /([^x]|^)ox+o(?!x)/, but then I need to prepend
> $1 to the replacement, e.g.
> 
> str.gsub(/([^x]|^)ox+o(?!x)/) { $1 + "replacement" }
> 
> .. and it gets even worse/impossible if one wants to non-match multiple
> characters.

If you can get a copy of Jeffrey Friedl's _Mastering_Regular_Expressions_ 
(O'Reilly) it might help significantly.  He covers cases such as these
(e.g., matching C and C++ comments while detecting single and
double-quoted strings with \-escapes...) and much else in great detail.

Rick
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