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Re: Negative expressions with alternation in ProxyRemoteMatch

by Roger (Parson)
on Aug 30, 2005 at 06:50 UTC ( #487657=note: print w/ replies, xml ) Need Help??


in reply to Negative expressions with alternation in ProxyRemoteMatch

Try negative look ahead.

my @str = qw/ a.jpg b.gif c.png d.txt e.jpeg a.jpg.3 /; for my $str (@str) { if ($str =~ /.*?\.(?!gif|jpe?g)/) { print "matched: $str\n"; } } __END__ # output is matched: c.png matched: d.txt matched: a.jpg.3


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Re^2: Negative expressions with alternation in ProxyRemoteMatch
by redhotpenguin (Deacon) on Aug 30, 2005 at 07:21 UTC
    Thanks for the help, this is what I was trying to do. Works great, and it makes sense that the '?!' (whabang?) is at the start of the alternation.
      An alternative is to use negative look behind... Your code was actually negative look ahead. To look behind, you need the < directive.

      /(?<!\.gif)(?<!\.jpg)(?<!\.jpeg)$/

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