Real-Time Matcher
Online RegEx Tester & Syntax Debugger
Test regular expressions against multiline strings in real time. Inspect capture groups, match indices, and flags with instant feedback.
Flags:
//gi
Quick Presets:
Real-Time Match Highlighting
Capture Group Inspector
Flags Toggle (g, i, m, s)
Built-in Pattern Library
How to Use Online RegEx Tester & Syntax Debugger (Step-by-Step Guide)
No software installation required. Complete your task in 3 easy steps directly in your browser.
1
Enter Regular Expression
Type your pattern and toggle flags (g, i, m, s).
2
Type Test String
Paste the source string you want to evaluate against.
3
Inspect Groups & Indices
Review real-time match blocks, capture groups, and copy the full regex.
How helpful was this tool?
Rated 4.9 / 5 by 3,420+ users worldwide
Share with Colleagues & Friends
Help others protect their document privacy
Got Questions?
Frequently Asked Questions
This tool uses your browser native ECMAScript RegExp engine, ensuring 100% fidelity with JavaScript, TypeScript, and Node.js.