Re: string matching specific number of times
- From: anno4000@xxxxxxxxxxxxxxxxxxxxxxx (Anno Siegel)
- Date: 30 Sep 2005 12:29:49 GMT
tester <tester@xxxxxxxxxxx> wrote in comp.lang.perl.misc:
> Hi All,
>
> My CPU taking 100% if I try to match more than the existing number of
> specific matches in a string. Script is ...
>
> my $something = "this is a test, just test, no kidding, small test, but
> error in test. over over";
> if ($something =~ m/((.*)test(.*)){5}/){
> print "number of matches are 5, successful";
> }
> else{
> print "no 5 matches, failure";
> }
>
> String "test" is repeated only 4 times in $something but if I am trying
> to check whether the $something has 5, my CPU taking 100%. What is the
> issue?
Probably excessive backtracking. Lots of alternatives have already been
proposed.
Anno
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