Regex Tester & Debugger
Quickly test and debug Regular Expression capture groups against real-time text arrays.
/
/
Example: Extracting emails with `([a-zA-Z0-9._-]+@[a-zA-Z0-9._-]+\.[a-zA-Z0-9_-]+)` and flags `gi`.
Test String Data
Evaluated Match Results 0 matches
Why Debug Regular Expressions Online?
Regular Expressions (Regex) are an incredibly powerful—and notoriously frustrating—tool for pattern matching and text extraction in software APIs. A tiny misplaced parenthesis or escape character can break formatting logic across an entire application.
Our completely private JavaScript Regular Expression Debugging Sandbox allows developers to rapidly iterate and visualize capture groups, match indices, and regex flags safely offline inside the browser. It natively supports `g` (global), `i` (case-insensitive), and `m` (multiline) flag injections.