URL Normailzation

Convert urls such as:
<a href="/testo/drupal/./cows/../moo/./foo/../../bar/../"></a>
to something simple like:
<a href="/testo/drupal/"></a>

This could be performed once on node insertion to elements such as <a>, <img>, <script>, <object>, and <form>

Pseudo Code:

1. preg_match all <a>, <img>, <script>, <object>, and <form> tags.
2. Take that list of matches, save the original matching url so it can be looked up again. Then normalize the url. (Use something like PathParser)
3. preg_replace all of the matches with the new url.

Would want to look out for poorly formatted tags. (No close bracket, funky characters, etc.)

Comments?