#!/usr/bin/perl -w
use strict;

my $str1 = "Hi(";
my $str2 = "hi";

if ($str2 =~ /\Q$str1\E/) #\Q...\E means like qr
                           #don't interpret characters
                           #like '(' within $str1
                           #use them verbatim
{
    print "Match: Yes\n";
}
else
{
    print "Match: No\n";
}
#prints Match: No


$str2 = "hI(";
if ($str2 =~ /\Q$str1\E/i) #/i means case insensitive
{
    print "Match: Yes\n";
}
else
{
    print "Match: No\n";
}
#prints Match: Yes
[download]

Basically if you want to match upon string where one or more characters would mean something to a Perl regex, you need to say that: "I don't want these special characters to count, i.e. mean something in a regex sense" - otherwise when Perl interpolates that string, those characters "will count". There are a couple of ways to say "please use all these characters verbatim", I showed one of these. qr is another.

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