Monkey Test It - Primate powered algorithms that scan your site for common bugs and SEO mistakes.
rubular - A ruby based regular expression editor
Reflect.run - Reflect is automated web testing that anyone can use. It requires no code, and no installation. Record once, run anytime.
RegExr - RegExr.com is an online tool to learn, build, and test Regular Expressions.
BugBug.io - BugBug makes test automation ultra-simple. It allows you to automate testing without coding, ensuring the quality of your web app or website without repetitive manual testing or writing a line of code.
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.