Regex Tester

Test a JavaScript regular expression against any text. See matches, capture groups and apply flags (g, i, m, s) instantly.

PATTERN

FLAGS

TEST STRING

MATCHES

2matches

#1 · INDEX 14hello@multitoolbox.online

#2 · INDEX 43team@example.com

Note: JavaScript / ECMAScript regex only. Do not wrap the pattern in slashes.

What is a regular expression?

A regex is a pattern that finds text. \\d+ means “one or more digits”. This tester uses the same engine as JavaScript in your browser.

Testing runs in your browser. Your pattern and text are never sent to any server and never stored.

Do I include the slashes /like this/?+

No. Type only the pattern, e.g. \d{3}-\d{4}. Flags are the buttons, not letters after a slash.

Why do I need the g flag?+

Without g, JavaScript stops at the first match. Turn g on to list every hit.

What are capture groups?+

Parentheses save parts of a match. In (\w+)@(\w+), group 1 is the name and group 2 is the domain.

Is this the same as Python or PCRE regex?+

It is JavaScript (ECMAScript) regex — the same as in the browser and Node. Lookbehinds and some Unicode details differ from Python and PCRE.

What if my pattern is invalid?+

The tool shows the error from the JavaScript engine (for example an unclosed bracket) instead of matches.

Is my text private?+

Yes. Everything runs locally. Safe for logs and sample data.

PLEASE WAIT...