I'm with Randal on this one. Why not just add the following comment?
# match a number using regular expreeion - for more # information, read "Learning Perl" or "Programming Perl", # both published by O'Reilly at: # http://www.ora.com

I mean, regular expressions are a foundation of Perl. Letting people loose on a Perl script who don't know what a regular expression is, is like letting a graphic designer build web pages without seeing or understanding the underlying code...

Ah, yes, well, ahem... cLive ;-)

In reply to Re: Optimization for readability and speed (code) by cLive ;-)
in thread Optimization for readability and speed (code) by deprecated

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":