Regex Tester

Test regular expressions against text. All processing happens in your browser.

Test your regex

Enter a regular expression pattern and test string. Matches will be listed below.

Regex pattern

Flags

Global (g)Ignore case (i)Multiline (m)Dotall (s)

Test string

Regex Tester

Test regular expressions (regex) against text. See matches, capture groups, and match positions in real time. Supports flags: global (g), ignore case (i), multiline (m), dotall (s). Debug regex before using in code, validate patterns, or learn how regex works with live feedback.

How to Test Regex

Enter your regex pattern (e.g., \d+, [a-z]+, or \b\w+@\w+\.\w+\b for email).
Paste or type sample text to search in.
Select flags (g, i, m, s). Click "Test" to see all matches and groups.

When to Use

Validate email/phone patterns, extract data from text, test regex for JavaScript/Python/any language, debug complex patterns, or learn regex syntax. Shows match index and capture groups. All in your browser.