$string =~ s/\</\&lt\;/g; 
$string =~ s/\>/\&gt\;/g; 
$string =~ s/[\"\'\}\{\)\(\+]//g;                 # Why???
$string =~ s/<!(?:--[\s\S]*?--\s*)?>\s*//g;       # Never matches
$string =~ s/[\~\^]//g;                           # Why???
$string =~ s/~!/ ~!/g;                            # Why???
$string =~ s/<*(javascript)[^>]+>//gi;            # Never matches
$string =~ s/(<[\s\/]*)(script\b[^>]*>)/$1x$2/gi; # Never matches
$string =~ s/<*(iframe)[^>]+>//gi;                # Never matches
$string =~ s/<*(script)[^>]+>//gi;                # Never matches