Re^2: Regexp: Match anything except a certain word


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Re^2: Regexp: Match anything except a certain word

by ikegami (Patriarch)

on Apr 21, 2006 at 17:15 UTC ( #544950=note: print w/replies, xml )

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in reply to Re: Regexp: Match anything except a certain word
in thread Regexp: Match anything except a certain word

That's not how you use the negative lookahead. It won't work. For example,

'<a href="..." target="...">' =~ /
   <a            # Matches '<a'.
   .+?           # Matches ' '.
   (?!target)    # Matches. (/\Gtarget/ doesn't match.)
   .+?           # Matches 'href="..." target="..."'.
   >             # Matches '>'.
/isx;
[download]

and

'<a target="..." href="...">' =~ /
   <a            # Matches '<a'.
   .+?           # Matches ' t'.
   (?!target)    # Matches. (/\Gtarget/ doesn't match.)
   .+?           # Matches 'arget="..." href="..."'.
   >             # Matches '>'.
/isx;
[download]

The common use of a negative lookahead is

/(?:(?!$re).)*/
[download]

See my earlier post for the fix.

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