Regex Pattern Tester
Regex → Matches
Test and debug regular expressions in real-time with pattern flags, match highlighting, and group capture breakdowns.
About this tool
About Regex Pattern Tester
Regex Pattern Tester is a free, browser-based tool that lets you test and debug regular expressions in real-time with pattern flags, match highlighting, and group capture breakdowns. It supports Regex → Matches. Everything runs locally on your device, so your files are never uploaded to a server. There's no sign-up, no watermark, and no limit — just open Regex Pattern Tester, add your input, and get results instantly.
How to use Regex Pattern Tester
1
Enter Regex Pattern
Type your pattern, select flags (g, i, m), and enter test string.
2
Analyze Matches
View matched strings, character indices, and captured groups.
3
Copy Pattern
Copy your finalized regex pattern string instantly.
Key features
Real-Time Matching
Instantly highlight matches and group captures as you refine your regex.
Flag Controls
Easily toggle global, case-insensitive, and multiline matching flags.
100% Private
Regex Pattern Tester processes your data locally in the browser. Nothing is uploaded, tracked, or stored u2014 your files never leave your device.
Completely Free
Use Regex Pattern Tester as much as you want with no fees, no watermarks, and no hidden limits.
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