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Re: Regex Backtracking

by frankus (Priest)
on Jun 12, 2002 at 17:00 UTC ( #173931=note: print w/replies, xml ) Need Help??

in reply to Regex Backtracking

What is happening is as it stands the regular expression is evaluating two characters at a time.Whereas the frame for the matches should be one character. A sloppy fix would be:
while (<DATA>) {
   $i=0 while s/\|\|/\| \|/g; # repeats as many times as is necessary
As joost rightly says the forward lookahead operation is probably the best way to go.
To make regexes easier to read try using the debug pragma:

use re 'debugcolor'

To get insight into how the regexes do what they do ;)

I'd love to find a solution using the 'c' modifier .. but then I'm not Abigail


Brother Frankus.


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