About Find & Replace It!
A powerful, cross-platform text file processor. It allows you to perform very complex batch replacements inside text files of any size. It supports regular expression syntax and dozens of encodings. It can batch processing the encoding of files, as well as style of end-of-line.

Here are some key features of Find & Replace It!:
- Find and replace across files
- Can search fixed string expressions as well as wildcard and regular expressions
- Handles text encoding while displaying, reading and writing file contents, including multi bytes encodings like Unicode
- Preserves line endings while processing files
- Preserves BOM while processing Unicode files
- Many more features

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