RegExr: Learn, Build, & Test RegEx
▻http://www.regexr.com
RegExr is an online tool to learn, build, & test Regular Expressions (RegEx / RegExp).
Results update in real-time as you type.
Roll over a match or expression for details.
Save & share expressions with others.
Explore the Library for help & examples.
Undo & Redo with Ctrl-Z / Y.
Search for & rate Community patterns.