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Regex Tester

Build and debug JavaScript regular expressions live.

1. Pattern

JavaScript regex flags

g: global; find all matches, not just the first.
i: case-insensitive.
m: multiline; ^ and $ match each line.
s: dotall; . also matches newlines.
u: unicode; full Unicode & \u{…} escapes.
y: sticky; match must start at lastIndex.

In Replace, $1, $2… reference capture groups; $& is the whole match.

Regular expression

/

/

2. Test string

Input

Highlighted matches

3. Match details

Showing the first 50 of matches.

4. Replace

Enable replace

Replacement

Use $1, $2, … to reference capture groups.

Result

Turn on replace to substitute matched text.

Share

The URL below carries your pattern, flags, and test string.

Test string is too long to include in the URL.

Share URL

Anyone with this link can read the values it contains. Do not use it for sensitive data.

How to use the Regex Tester

Type a regex and pick flags (g, i, m, s, u, y).
Paste sample text below.
Matches and capture groups highlight live as you type.

Frequently asked questions

Which regex flavor is supported?: JavaScript regex (ECMAScript). Lookbehinds and Unicode property escapes work in modern browsers.