About Find & Replace It!
A powerful search and replace utility. It allows performing very complex batch replacements inside text files of any size. It supports regular expression syntax and dozens of encodings. It has scripting capabilities which allow transforming on the fly the replacement text for every found string. It even handles batch processing of the encoding of files, as well as of types of end-of-lines.

Here are some key features of Find & Replace It!:
- Find and replace in multiple files
- Search for regexp and rexexp tester
- Supports many text encodings
- Provides a find & replace preview
- Offers a scripting interface that allows to transform replacement text on the fly
- Many more features

Read more: http://www.apple.com/downloads/macosx/development_tools/findreplaceit.html