🧠 Regex Tester

Test JavaScript-compatible regular expressions. Live matches, groups, and error hints. Runs in your browser.

Pattern & Flags

Test Text

Highlighted Matches

Match Details

What is Regex?

Regular expressions (regex) are patterns used to match strings. Developers use regex for validation, search, and text processing.

How to use this regex tester

Enter a regex pattern and optional flags (g, i, m, s, u, y).
Paste test text and see live highlighted matches.
Inspect capture groups and match details in JSON view.