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  1. or download this
    # read file into $file

...
$file =~ s/src\s*=\s*("|')(.*?)\1/'src="'.lc($2).'"'/ges;

# write file here
  2. or download this
    
$file =~ s/href\s*=\s*("|')([^>]*?)\1/'href="'.lc($2).'"'/ges;
$file =~ s/src\s*=\s*("|')([^>]*?)\1/'src="'.lc($2).'"'/ges;