Medium - Welcome to Medium, a place to read, write, and interact with the stories that matter most to you.
rubular - A ruby based regular expression editor
Blogger - Publish your passions, your way. Create a unique and beautiful blog. It’s easy and free.
RegExr - RegExr.com is an online tool to learn, build, and test Regular Expressions.
Tumblr - A feature rich and free blog hosting platform offering professional and fully customizable templates, bookmarklets, photos, mobile apps, and social network integration.
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.