How to Use the Regex Playground
- 1Enter your regex pattern
Type your regular expression in the pattern field at the top. Supports all JavaScript regex syntax: lookaheads, lookbehinds, named capture groups, character classes, Unicode, and all quantifiers.
- 2Add your test string
Paste or type any text in the test input. The regex engine processes it in real-time and highlights every match as you type — no need to click a button.
- 3Read the match results
The match panel shows every match with its start/end position, capture groups by index, and named groups by label. Use the flags toolbar to toggle global, case-insensitive, multiline, and other modes.
Features
Real-time Regex Testing
Test regular expressions instantly. Matches are highlighted as you type with no delay — no submit button needed.
Visual Match Highlighting
Every match, capture group, and named group is color-coded and labeled so you can see exactly what your regex captures.
All Regex Flags Supported
Use g (global), i (case-insensitive), m (multiline), s (dotAll), u (unicode), and y (sticky) flags independently or combined.
Regex Translator
Paste any regex and get a plain English explanation of every component — anchors, quantifiers, groups, lookaheads, and more.
Visual Regex Debugger
Step through your regex execution character by character. See exactly where the engine backtracks and how matches form.
50+ Ready-to-Use Patterns
Browse a curated library of regex patterns for email validation, URL matching, phone numbers, dates, IPs, and more.
What is a Regex Playground?
A regex playground is an online tool where you can write, test, and debug regular expressions interactively. Instead of running code in your editor to check a pattern, you paste your regex and test string directly into the browser and see matches highlighted in real-time. RegexPlayground Pro goes further with a built-in regex translator, a visual step-by-step debugger, and a library of 50+ ready-to-use patterns — all free, no registration required.