[Melbourne-pm] case insensitive REs

wigs at stirfried.org wigs at stirfried.org
Tue May 6 21:20:22 PDT 2008

On Wed, May 07, 2008 at 02:11:23PM +1000, Tim Connors wrote:
> I want the user to be able to supply a -i flag to my program to make 
> global case insensitive searching.
> Except that when I actually go to perform the RE operation in perl, it 
> only takes /i as a modifier.  I can't simply say, where $case contains 
> either "i" or "":
>   while (/($re)/g$case) {
>      ...
>   }

You can include matching operators inside the regex; for example:

   my $pattern = "(?i)foobar";
   if ( /$pattern/ ) { }

This example is taken straight from perldoc perlre, under the 'Extended
Patterns' section.



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