I came again across "http://www.mysqludf.org/lib_mysqludf_str/index.php" and found the library useful but I could not figured out how to install and use them on WAMP Server version 2.0 with MySQL version 5.1.36 on Windows 7.
I did followings steps but did not get the work done:
1. Created a directory named "plugin" in the path "C:\wamp\bin\mysql\mysql5.1.36" and copied the "lib_mysqludf_str.dll" file in the directory
2. Added the line 'plugin_dir=c:/wamp/bin/mysql/mysql5.1.36/plugin' within my.ini configuration file in the [mysqld] and [wampmysqld] section
3. Restarted the server and connected as root to mysql server using mysql database
4. Executed CREATE FUNCTION lib_mysqludf_str_info returns string SONAME'lib_mysqludf_str.dll';
Error: Can't Open Shared Library 'lib_mysqludf_str.dll'
Your support and feedback will be appreciated in advanced.