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🧪 Regex Tester

Test and debug JavaScript regular expressions. Highlight matches and quickly verify regex patterns.

Regex Tester

Test regular expressions against sample text. Toggle flags, preview matches with highlights, and export your results.

Preview (highlighted)

hello world Worldly matters

Matches

world at index 6

How to use this tool

Write or paste your regex pattern and choose the flags you need.
Test against sample input to see highlighted matches and capture positions.
Export the summary to share with teammates or stash in documentation.

Developer workflows

Debug complex validation rules before deploying to production.
Craft find-and-replace patterns for IDEs with confidence.
Teach regex concepts by showing how matches change with each flag.

Troubleshooting tips

Syntax errors surface immediately in the banner above the preview.
Use the sticky (y) flag to continue matching from the last index when needed.
Remember that the global flag is required to highlight multiple matches.

FAQ

Which flavor of regex is used?: Patterns run in the browser using JavaScript’s RegExp engine, so syntax mirrors ECMAScript.
Can I test multiline input?: Yes. Toggle the multiline (m) flag to change how ^ and $ anchors behave.
Do you support replacement?: This tool focuses on matching. Use your editor or add-on scripts to preview replacements.

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