Generate Integers from a Regex

Generate Integers from a Regex gives you a fast way to create random numbers that follow a digit-based pattern. Whether you want to mock test data or generate examples that fit a format (like \d{4}[5-9]), this tool turns your pattern into a working list of integers instantly.

It works entirely in your browser you provide the regex-like pattern, tell it how many results you want, and it outputs live. You can tweak the seed for consistent results or toggle output size using the maximize option. Everything’s private, instant, and flexible.

Total generated: 0
Options
Maximize output

How to Use:

  • Enter a regex-style digit pattern in the top input.
    • Supports: \d, [x-y], {n}, and plain digits
    • Example: \d{3}[2-9] creates 3 digits followed by 2–9
  • Set How many integers to generate (up to 1000).
  • Optionally enter a Seed for repeatable random results.
  • Flip the Maximize output toggle to expand the output area.
  • Click Generate to create integers that match your pattern.
  • The output updates live and flashes when changed.
  • Click Copy Output to copy all results.
  • Click Export to File to save as a .txt.
  • Hit Clear All to reset everything to default.

What Generate Integers from a Regex can do:

  • Generate random integers that match simplified regex-style rules.
  • Support repetition (\d{4}), character classes ([3-9]), and literal digits.
  • Use seed input to get the same results every time.
  • Instantly generate up to 1000 numbers.
  • Update output live with flashing border and result counter.
  • Export or copy generated results easily.
  • Stay secure no data leaves the browser.

Example:

Pattern:

\d{3}[5-9]

How many: 5

Output:

1637
7459
0427
8937
2056

Common Use Cases:

Use this tool to mock up integers that match constraints for forms, IDs, validation tests, or data generation tasks. It’s great for QA, devs, educators, or anyone needing lots of fake but format-respecting integers. And since it’s browser-based, you can use it offline or safely on sensitive devices.

Useful Tools & Suggestions:

If you’re using Generate Integers from a Regex, try Generate Regex from Integers to reverse-engineer a pattern from your number set. And once you’ve got your matches, Highlight Integers can help you visually scan which values fit the expression.

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