RegExr 2
RegExr: Learn, Build, & Test RegEx
 RegExr is an online tool to learn, build, & test Regular Expressions (RegEx / RegExp).   Supports JavaScript & PHP/PCRE RegEx. Results update in real-time as you type. Roll over a match or expression for details. Validate patterns with suites of Tests. Save & share expressions with others. Use Tools to explore your results. Full RegEx Reference with help & examples. Undo & Redo with {{getCtrlKey()}}-Z / Y in editors. Search for & rate Community Patterns.  