RegExr - RegExr.com is an online tool to learn, build, and test Regular Expressions.
Codespace - A beautiful cross-platform code snippet manager
rubular - A ruby based regular expression editor
30 seconds of code - JS snippets that you can understand in 30 seconds or less.
RegEx Generator - RegEx Generator is a simple-to-use application that comes with the brilliance of intuitive regex and is also helping you out to test the regex.
DhiWise - DhiWise is a ProCode platform that helps you build clean, scalable, and customizable native and cross-platform apps. Focus on what matters as a programmer and let DhiWise do the rest.