Production-Ready JavaScript Regex Tester

JavaScript Regex Tester

Test and debug regular expressions in real-time with native JavaScript RegExp accuracy, highlighted text, capturing groups, replace testing, and pattern explanations.

Pattern & Inputs
//gi
0 chars | 0 lines
Native JS RegExp Engine

Evaluating regex pattern matches against test string...

#Match TextIndexLengthGroups
Result after Replacement:
Status: ReadyMatches Found: 0

Curated Regex Presets

Click any preset to load validation or extraction pattern rules instantly.

Native RegExp Engine

Uses browser native RegExp engine for 100% execution accuracy including named capturing groups.

All 6 RegExp Flags

Full support for `g` (global), `i` (ignoreCase), `m` (multiline), `s` (dotAll), `u` (unicode), and `y` (sticky).

XSS-Safe Highlighting

Safely escapes user input to prevent HTML script execution while rendering visual match highlights.

What is a Regex Tester?

A Regex Tester allows software engineers to compose, test, and validate Regular Expression (RegEx) patterns against test data strings.