<p>For more information about regular expressions, have a look at the
perl regular expression manpage ("<a
- href="http://www.perldoc.com/perlre.html">perldoc
+ href="http://perldoc.perl.org/perlre.html">perldoc
perlre</a>"). If you are interested in more detailed
information about regular expressions and their variants
(POSIX regex etc.) the following book is dedicated to this topic:</p>