Regex Tester
Test regular expressions in real-time
Regular Expression:
Flags:
//g
Highlighted matches will appear here...
About this tool
Regular Expression Tester
Overview
An online IDE for testing and debugging regular expressions. It highlights matches instantly, breaks down capture groups, and lets you toggle matching flags (global, case-insensitive, multi-line) — all running locally in your browser. A built-in cheatsheet helps you remember the right symbols.
Key features
- •Real-time regex match highlighting in your test strings
- •Detailed capture groups breakdown with indexed table
- •Configurable matching flags (g, i, m, s, u, y)
- •Pre-compiled cheatsheet for common patterns (emails, IPs, dates)
- •Client-side execution with zero external analytics
How to use
- 1Enter your regex pattern in the top field.
- 2Paste your test string into the body textarea.
- 3Check the matching flag boxes (Global, Case Insensitive, etc).
- 4Review the highlighted matches and the capture groups table.
- 5Use the cheatsheet panel to construct or debug your expression.
Frequently asked questions
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