Generally you should avoid using $', $& and $'. Once they appear in your program they slow down all regular expression calls.
This is true and good advice but if you are using perl 5.10.0 or later there is the option of using /P and the variables ${^PREMATCH}, {$^MATCH}, and ${^POSTMATCH} where the cost is confined to only the regular expressions that use them.
In this case, though, there doesn't appear to be any advantage to using /P.
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
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or How to display code and escape characters
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