regexp
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A Regular Expression is the term used to describe a codified method of searching invented , or defined , by the American mathematician Stephen Kleene. The syntax (language format) described on this page is compliant with extended regular expressions (EREs) defined in IEEE POSIX 1003.2 (Section 2.8).
Regular Expressions - a Simple User Guide
TextCrawler is a fantastic tool for anyone who works with text files. This cool utility enables you to instantly find and replace words and phrases across multiple files and folders.
TextCrawler - Search and Replace across files - Freeware
Here is a non comprehensive list of tools I made and how to download them: NOTE: you can get the source code and contribute to most of these over here
Tools - Roy Osherove - Team Leadership, Agile Development & .NET - Speaking, Consulting, Training and Tools
Using Regular Expressions in PHP and JavaScript - O'Reilly Answers
Using Regular Exp ressions in PHP and Javascript By Robin Nixon ( O'Reilly page | Amazon page )
Advanced Regular Expression Tips and Techniques
Twice a month, we revisit some of our readers’ favorite posts from throughout the history of Nettuts+. Regular Expressions are the Swiss Army knife for searching through information for certain patterns.