You might want to try one of the modules that parses html, or you could try...
# read file into $file
$file =~ s/href\s*=\s*("|')(.*?)\1/'href="'.lc($2).'"'/ges;
$file =~ s/src\s*=\s*("|')(.*?)\1/'src="'.lc($2).'"'/ges;
# write file here
It's a little complicated, this regex, and I'm too tired to explain it all (sorry), but you can use the Camel or docs to fill in the blanks...
cLive ;-)
ps - it assumes that all URL's etc are well formed. For safety, you might want to use this instead:
$file =~ s/href\s*=\s*("|')([^>]*?)\1/'href="'.lc($2).'"'/ges;
$file =~ s/src\s*=\s*("|')([^>]*?)\1/'src="'.lc($2).'"'/ges;
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