RegExp Tester & Cheat Sheet
Build, test, and debug regular expressions with live match highlighting, sortable results, and a searchable syntax reference — all in your browser.
Regular Expression
Test String
Matches
0 MatchesMatches highlighted in your test string will appear here.
| # | Match | Index | Length | Groups |
|---|
No matches yet — enter a pattern and some text above.
Regex Cheat Sheet
A quick reference for common syntax — search to filter instantly.
No matching tokens found.
Why Use Our Regex Tester?
🔒 100% Client-Side
Your patterns and text never leave your browser — nothing is uploaded.
📁 File Uploads
Load a pattern or a large text/log file directly instead of pasting manually.
📊 Sortable Results
Order matches by position, length, or alphabetically to spot what matters.
⬇️ Multi-Format Export
Save your results as JSON, CSV, or plain text with one click.
Frequently Asked Questions
To show a complete results table, the tool always scans for every occurrence internally. The flags you set still control case sensitivity, multiline behavior, and other matching rules exactly as they would in your own code.
The tool reads the first non-empty line of the uploaded file as your pattern. For the test string upload, the entire file content is loaded as-is.
Yes — every export format (JSON, CSV, and TXT) includes the match text, its index, length, and any capture groups, sorted the same way as the on-screen table.