WordPress Database Search & Replace plugin
Change logs:
version 0.2.0:
1. Improved performance.
version 0.1.3:
1. Fixed a minor bug.
version 0.1.2:
1. Fixed a bug where table prefixes including multiple "_" (underscore) characters would not replace properly.
version 0.1.1:
1. Added a fix for replacing special characters
version 0.1.0:
1. Initial release
