i Hate Regex - regex cheatsheet for the haters
RegexLearn - RegexLearn makes it simple to learn, practice, test, and share RegEx.
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.
Regex Crossword - Welcome to the fantastic world of nerdy regex fun!
RegExr - RegExr.com is an online tool to learn, build, and test Regular Expressions.
Practice Makes Regexp - 50 exercises to help you master regular expressions