regex - Perl: Replacing links (html) that meet certain criteria -


on forum, want automatically add rel="nofollow" links point external sites. instance, creates post following text:

link 1: <a href="http://www.external1.com" target="_blank">external link 1</a> link 2: <a href="http://www.myforum.com">local link 1</a> link 3: <a href="http://www.external2.com">external link 2</a> link 4: <a href="http://www.myforum.com/test" alt="local">local link 2</a>

using perl, want changed to:

link 1: <a href="http://www.external1.com" target="_blank" rel="nofollow">external link 1</a> link 2: <a href="http://www.myforum.com">local link 1</a> link 3: <a href="http://www.external2.com" rel="nofollow">external link 2</a> link 4: <a href="http://www.myforum.com/test" alt="local">local link 2</a>

i can using quite few lines of code, hoping 1 or more regexes. can't figure out how.

i'd use regex gobal , eval flag callback, eg so:

#!/usr/bin/perl  use strict;  $internal_link = qr'href="https?:\/\/(?:www\.)?myforum\.com';  $html = ' lorem ipsum <a href="http://www.external1.com" target="_blank">external link 1</a> lorem ipsum <a href="http://www.myforum.com">local link 1</a> lorem ipsum <a href="http://www.external2.com">external link 2</a> lorem ipsum <a href="http://www.myforum.com/test" alt="local">local link 2</a> ';  $html =~ s/<a ([^>]+)>/"<a ". replace_externals($1). ">"/eg;  print $html;  sub replace_externals {     ($inner) = @_;     return $inner =~ $internal_link ? $inner : "$inner rel=\"nofollow\""; }

alternatively can surely use negative look-aheads, mess readability..


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