i Hate Regex - regex cheatsheet for the haters
RegexLearn - RegexLearn makes it simple to learn, practice, test, and share RegEx.
UltimateRegexResource - Regex syntax and resources to power up your programming
RegExr - RegExr.com is an online tool to learn, build, and test Regular Expressions.
UI Bakery - An intuitive visual internal tool builder. Allows you to create admin panels, CRMs, customer support tools on top of your database. Integration with MySQL, PostgreSQL, MongoDB, and more. Add business logic, manage user permissions, share your app.
GitHub for Mobile - The world’s development platform, in your pocket