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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

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.

Regex Powertoy (interactive regular expressions)

http://answers.oreilly.com/topic/985-using-regular-expressions-in-php-and-javascript/

Using Regular Exp ressions in PHP and Javascript By Robin Nixon ( O'Reilly page | Amazon page )

Using Regular Expressions in PHP and JavaScript - O'Reilly Answers

Reggy - Home

a Ruby regular expression editor and tester

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).

http://www.zytrax.com/tech/web/regex.htm

Regular Expressions - a Simple User Guide

do-it-with-sed

regexxer Search Tool

http://www.digitalvolcano.co.uk/content/textcrawler

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.