Parsing HTML

Hi All, I would like to be able to do a serach and replace in a HTML document. For a list of words; for example: hello become buongiorno yes becomes si size become grossezza The problem is that if I change the word "size" without considering html tags and html comments in the case of inline javascripts I'll end up with "broken" html. Is there a way to only do the search and replace outside the tags and comments. It is further complicated by the fact that I would still like to do the replacements within strings for example within meta tags! Any ideas. Henry