Learn, Build, & Test RegEx

RegExr is an online tool to learn, build, & test Regular Expressions (RegEx / RegExp).

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• 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.