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Regex Data Generator — Generate Sample Strings From a Pattern

Generate 1–100 strings that match any regex pattern. Great for test data, fixtures, and fuzzing.

Free No signup Client-side Privacy friendly
Generating…

samples

How to use

  1. 1 Type or paste a regex pattern. Don't wrap it in slashes — just the body.
  2. 2 Set the count slider (1–100).
  3. 3 Hit Sample for a phone-number example to see how the syntax works.
  4. 4 Copy the list or download as plain text.

Why use this tool

  • Powered by <code class="font-mono text-xs">randexp</code> — generates strings that match a given regex.
  • Library loaded lazily — page stays light.
  • Great for seeding test data, fixtures, or fuzzing inputs.
  • Pure client-side — your patterns and outputs stay local.

Frequently asked questions

Why are anchors stripped?

randexp builds strings from the pattern body — anchors (<code class="font-mono">^</code>, <code class="font-mono">$</code>) describe position rather than content, so they're removed automatically with a note above the output.

How is open-ended <code class="font-mono">.*</code> handled?

Quantifiers without a max bound are capped at 32 repetitions so output stays usable.

Can I use lookaheads or backreferences?

Lookarounds and backreferences are not supported by randexp's generation strategy. Most character classes, groups, alternation, and quantifiers do work.

Summary

Regex Data Generator is a free developer utility by Zerethon Tools. Generate 1–100 strings that match any regex pattern. Great for test data, fixtures, and fuzzing. Runs entirely in the browser — no signup, no upload.

Category
Developer
Pricing
Free
Privacy
Browser-based
Signup
Not required

Privacy

Your data never leaves your browser unless explicitly stated. Regex Data Generator runs entirely client-side — no server upload, no logging, no tracking of your input.

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