On Monday 27 September 2010 12:21:51 hpant pant wrote:
> Hi ,
> can anyone explain me, how below code works ,dealing with nested patterns.
> i am not able to understand the ((?:(?!BEGIN)(?!END).)*) part.
>
> while (s/BEGIN((?:(?!BEGIN)(?!END).)*)END//gs) {
> # do something with $1
> }
?! is a zero-width negative look-ahead assertion (see
http://perldoc.perl.org/perlre.html although it's not very accessible). I
believe what the pattern means is to match everything between BEGIN and END
which does not contain either "BEGIN" or "END".
Regards,
Shlomi Fish
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