Help With Replace

[gar onn]

PHP has many functions to replace strings, But I do not understand how things like this work:

preg_replace("/(<\/?)(\w+)([^>]*>)/e", "'\\1'.strtoupper('\\2').'\\3'",  $html_body);

could someone explain this and say what the above code does?

yes, I've red the pages on php.net

[Synook]

Firstly, do you know what regular expressions are? If not, you may want to read up about them somewhere like http://www.regular-expressions.info/.