Online Regex Tester & Debugger
Test and debug JavaScript regular expressions online with live pattern matching, flag toggles, and regex breakdown cheatsheet.
100% Client-Side Privacy (No Upload)
//gi
Matches (0)
No regex matches found in test string.
How to Use Regex Tester & Debugger
- 1Type your regular expression pattern in the expression field.
- 2Toggle flags (Global `g`, Case Insensitive `i`, Multiline `m`).
- 3Paste test strings into the text body.
- 4View instant highlighted matches and capture groups.
Key Features
- Real-time regex evaluation with visual match highlight badges.
- Supports flags: `g`, `i`, `m`, `s`, `u`.
- Detailed capture group output panel.
Frequently Asked Questions (FAQ)
ToolHub uses the native browser JavaScript RegExp engine for 100% fidelity.
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