DEVELOPER
Regex Tester & Debugger
Test regular expressions with live match highlighting, capture groups, and flags.
//g
Highlighted matches
Contact us at hello@toolsify.online or visit https://toolsify.online
Matches
Match 1: Contact
Index 0–7
Match 2: us
Index 8–10
Match 3: at
Index 11–13
Match 4: hello
Index 14–19
Match 5: toolsify
Index 20–28
Match 6: online
Index 29–35
Match 7: or
Index 36–38
Match 8: visit
Index 39–44
Match 9: https
Index 45–50
Match 10: toolsify
Index 53–61
Match 11: online
Index 62–68
Free Regex Tester & Debugger
Test JavaScript regular expressions with live highlighting, capture groups, and common pattern shortcuts. Ideal for validating emails, URLs, phone numbers, and custom parsing rules.
How to use
- Enter a regex pattern and choose flags.
- Paste your test string below.
- Review highlighted matches and capture groups instantly.
Frequently Asked Questions
- What regex flavor does this use?
- This tool uses JavaScript regular expressions, the same flavor supported by modern browsers and Node.js.
- Does my data leave my browser?
- No. Pattern matching runs entirely on your device in real time.
- What do the regex flags mean?
- g = global, i = case-insensitive, m = multiline, s = dotAll, u = unicode.