Never again do I want to see code like: 
if ($foo =~ /^$bar$/) { ... }
if ($foo =~ /^$bar$/i) { ... }
if ($foo =~ /\A$bar\Z/i) { ... }
if ($foo =~ /\A$bar\z/i) { ... }

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If you were to really want to use a regex, you'd use 
/^\Q$bar\E\z/i

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But you wouldn't even then, because you're not that silly. Use string comparison functions where they should be used. Regexes are for patterns -- =~ is the "pattern-match binding operator".

Sigh. And this, coming from Mr. I Love Regexes. It must be serious. 

if (lc($foo) eq lc($bar)) { ... }

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japhy -- Perl and Regex Hacker

In reply to Regexes Are Not For String Comparison by japhy

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