Regex Playground & Live Pattern Visualizer
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Free Regex Playground & Live Pattern Visualizer

Fast, 100% client-side regular expression tester and syntax highlighter. Test complex regex patterns with live capture group inspection and zero data transmission.

Related keywords:#free regex tester#regular expression visualizer#javascript regex debugger#client-side regex validator

Key Capabilities & Use Cases

Safe Sensitive Log Debugging

Test patterns against real-world production logs, API tokens, and user records with zero risk of server data leaks.

Real-Time Group Breakdown

Inspect named capture groups, non-capturing matches, and lookaheads with distinct color-coded highlighting.

Instant Flag Toggling

Easily switch Global (g), Case-Insensitive (i), Multiline (m), and DotAll (s) regex flags on the fly.

How to Use & Shortcuts

Ctrl / Cmd + EnterFormat and test regex expression
EscClear sample test string

Frequently Asked Questions (FAQ)

Is it safe to test sensitive data here?
Yes, 100%. The regex engine runs entirely in your local browser JavaScript VM. Nothing is ever sent to a server.
What regex flavor is supported?
It uses modern ECMAScript (JavaScript) regular expression standard, including unicode properties, lookbehinds, and named groups.
Open Source Provenance & License
MIT License
AuthorDeveloper Tools Open Initiative
Upstream SourceGitHub Repository
Inspect SourceRaw Standalone HTML
Compliant with upstream open-source licensing. Sandboxed and hosted on Pagepod.iframe sandbox="allow-scripts..."

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