This tool generates random strings that match a given regular expression pattern. It is useful for testing form validators, generating test data, exploring what a regex matches, or creating mock inputs for APIs and databases.

Supported Regex Features

Character classes: [a-z], [A-Z0-9], [^abc]
Quantifiers: *, +, ?, {n}, {n,m}
Anchors: ^, $ (treated as positional hints)
Shorthand classes: \d, \w, \s, \D, \W, \S
Alternation: (cat|dog|bird)
Groups: (abc), (?:xyz)

Example Patterns

\d{4}-\d{2}-\d{2} — Date like 2024-03-15
[A-Z]{2}\d{4} — Ticket code like AB1234
[a-z]{5,10}@[a-z]{3,8}\.(com|net|org) — Email-like
#[0-9A-Fa-f]{6} — Hex color code
\+44\d{10} — UK phone format

Frequently Asked Questions

Can I use any regex?

Most standard regex patterns work. Lookaheads, lookbehinds, and backreferences are not supported in the generator. Patterns should be reasonably bounded — avoid unbounded quantifiers like * with no upper limit on long patterns.

Is this random?

Yes, each click generates new random strings. Character classes pick random characters from the allowed set, and quantifiers pick random counts within the specified range.

Text from Regex online

Generate random strings that match a regular expression — runs in your browser

Supported Regex Features

Example Patterns

Frequently Asked Questions

Can I use any regex?

Is this random?