See the below code. I declared one variable and assigned the name. For the same Code first time it's working and second time it's not working. What would be the reason ?

#!/usr/local/bin/perl
use strict;
use warnings;

my $regexp = 'Perl Monks';

if($regexp =~ m/^Perl Monks/gi) {
    print "\nFound..";
} else {
    print "\nNot Found..";
}

if($regexp =~ m/^Perl Monks/gi) {
    print "\nFound.1.";
} else {
    print "\nNot Found.1.";
}
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Update : Title change as per ww suggesion