Regex & TextInteractive
Regex Tester
Build, debug, and test regular expressions in real time. Features flags selection (g, i, m, s, u), visual match highlighting, match count badge, and detailed capture group listings.
Your input is processed locally in your browser and is not sent to our server.
//giu
Presets:
Test Text2 matches found
Matched Occurrences & Capture Groups
| # | Index | Full Match | Capture Groups |
|---|---|---|---|
| 1 | 32 | support@devfixhub.com | Group 1: "support"Group 2: "devfixhub.com" |
| 2 | 57 | admin@example.org | Group 1: "admin"Group 2: "example.org" |
Key Features
- Real-time regex evaluation as you type
- Configurable flags: global (g), case-insensitive (i), multiline (m), dotAll (s), unicode (u)
- Live match counter and match index positions
- Capture group extraction table
- Catches regex syntax errors with helpful error messages
- Zero network latency - runs in client JavaScript
How to Use Regex Tester
- 1Enter your regular expression pattern without enclosing slashes.
- 2Select the regex flags you want to enable (e.g. g, i).
- 3Type or paste the test string in the text editor below.
- 4Examine the highlighted matches and capture groups table.
Frequently Asked Questions
What does the 'g' flag do?
The 'g' (global) flag finds all occurrences of the pattern in the test string instead of stopping after the first match.
What flavor of regex does this tool use?
It uses modern ECMAScript (JavaScript) regular expressions, supporting lookbehind, named groups, and unicode property escapes.
Related Developer Solutions & Tools
Recommended Tools
Related Error Fixes