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s/href\s*=\s*/href=/ig; s,(?<!(?i:href=))((?:http|ftp|news)://\S*),<a href="$1">$1</a>,g; ... You might try to think of something besides '\S*' also, in case the user puts in a period after the href, or puts it between parenthesis or ???.
# Now its starting to get ugly! $str =~ s#((?i:<a\s+href\s*=\s*"?)?(?:http|ftp|news)://[^"]+)#substr($ +1,0,1) eq '<' ? $1 : qq!<a href="$1" >$1</a>!#eg;
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