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find_in_pageDeveloper Tools22 TOOLS AVAILABLE

Regex tester

Build and debug regular expressions with real-time matching and detailed capture group explanations.

Advanced utility for web development and data engineering.

//
check_circle2 matches found

2 matches found

1

hello@example.com

Position 1:13

Group 1: helloGroup 2: example.comlocal: hellodomain: example.com
2

ops.team@test.org

Position 2:9

Group 1: ops.teamGroup 2: test.orglocal: ops.teamdomain: test.org

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Precision

The expression recompiles on every keystroke so you can verify the pattern, flags, and replacement before using it in real code.

Live matching

Everything runs entirely in the browser and keeps your test text on the current device.

Capture groups

Numbered and named groups appear under each match so you can see exactly what was captured.

Frequently Asked Questions

How are matches counted?expand_more
The tester walks the text with your expression and lists each match. Zero-length matches are handled safely so the loop keeps advancing.
Which flags should I turn on?expand_more
Use g to find multiple matches, m to make ^ and $ work per line, i to ignore case, u for Unicode-aware matching, and s to make dot match newlines too.