s/(["'`])/'%'.unpack 'H*',$1/eg;

##</code><code>##

s/(\W)/'%'.unpack 'H*',$1/eg;

##</code><code>##

s/([^\w;\/?:\@&=\+\$,\[\]\-\.!~\*'\(\)])/'%'.unpack 'H*',$1/eg;