Which regex flavor does it use?

The tool uses the standard JavaScript (ECMAScript) regular expression engine.

Are regex flags supported?

Yes, you can toggle the g, i, m, s, and u flags.

Yes, matched groups are listed separately below the highlighted result.

No, matching happens entirely in your browser.

Yes, enable the multiline (m) flag to match line by line.

Test regular expressions against a sample string with live match highlighting and capture groups.

Regular expression

//gi

Test string

Matches: 2

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Strong password generator with customizable rules

Generate unique UUID v4 identifiers

Format and syntax-highlight JSON

Check JSON syntax and find errors