Str_rexp is a tag based approach to php’s str_replace for expressionengine, it functions like this:

{title}: “Foo goes to the movies” becomes “Bar goes to the movies”.

{exp:channel:entries }
{exp:str_rexp needle=”Foo” replace=”Bar” haystack=”{title}” }
{/exp:channel:entries}

Install: unzip in your expressionengine third_party folder.

Download: str_rexp.zip

Let me know if you find this useful.