table-wide or database-wide search and replace?

Has anyone seen or built an existing chunk of code to assist with table-wide or database-wide search and replace in MySQL? For example a simple str_replace() style function that works on a whole MySQL table would be great, database-wide would be even better, ereg_replace would be even better again, and so would the ability to specify case sensitivity would be better again :) I'm happy for it to be a commerical product, open source, a project or whatever. If it doesn't exist, does anyone want to start work on one with me? Found these notes: http://myezserver.com/downloads/mitel/howto/mysql-search-and-replace-howto.h tml So it doesn't seem too hard in theory. Justin French