If I understand what you want then the followin regex code using a negative lookahead assertion is one way to do the trick:

use strict;
use warnings;

while (<DATA>) {
    print "Match $_" if /58=Invalid(?:(?!59=3).)*$/;
}

__DATA__
58=Invalid Contract;59=3;45=Test;23=Test12
58=Invalid Contract;45=Test

[download]

Prints:

Match 58=Invalid Contract;45=Test

[download]
DWIM is Perl's answer to Gödel

In reply to Re: Match and not match by GrandFather
in thread Match and not match by minixman

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