Have a look at the qr-operator

sample:
#!/usr/bin/perl

use strict;
use warnings;

my $extensions = qr/\.doc|\.gif/;

my @files = qw(test.doc test.gif test.png test.jpg);

for(@files){
    if($_ =~ $extensions){
        print "yes\n";
    }
}

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In reply to Re: how to get the String as regularexpression by reneeb
in thread how to get the String as regularexpression by arunmep

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