Generate Regex from Integers

Generate Regex from Integers takes a list of numbers and instantly turns them into a regular expression pattern. Whether you’re matching specific values, enforcing numeric rules, or cleaning up logs, this tool helps you get there fast. It works right in your browser, no reloads or installs needed.

You can switch between exact, word-bound, or prefix-based matching styles and customize the output using a few handy toggles. It’s lightweight, fast, and flexible.

Paste your input above or import a file below.
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Supported file types: .txt, .csv, .tsv, .log, .json, .xml, .md, .ini, .yaml, .yml, .html, .htm, .css
Total items: 0
Options
Remove duplicates
Sort integers
Maximize output
Regex pattern:

How to Use:

  • Paste or type integers into the Input Integers box (one per line or space/comma-separated).
  • Use the toggle switches to adjust:
    • Remove duplicates – Gets rid of repeat values automatically.
    • Sort integers – Sorts your input numerically.
    • Maximize output – Expands the output textarea for easier viewing.
  • Pick your desired Regex pattern mode:
    • Exact match – Generates a non-capturing group: (?:123|456)
    • Starts with – Anchors regex to the beginning: ^(123|456)
    • Whole word – Wraps with \b word boundaries: \b(?:123|456)\b
  • Output updates live below as you type or toggle.
  • Click Copy Output to copy the regex or Export to File to save as .txt.
  • Hit Clear All to reset everything.

What Generate Regex from Integers can do:

This tool helps you build accurate regular expressions from sets of integers without needing to write regex by hand. It’s perfect for backend pattern filters, input validation, data extraction, and quick grep matching.

You can remove duplicates, sort values, and choose how strict or flexible your regex pattern is all without touching a single backslash. It’s great for when your inputs are dynamic but your pattern needs to stay sharp.

The output’s always ready as you type, and everything happens instantly in-browser. No popups, no surprises. Just fast, clean regex.

Example:

Input:

123
456
123
789

Output (Exact match, sorted, duplicates removed):

(?:123|456|789)

Output (Whole word):

\b(?:123|456|789)\b

Common Use Cases:

You might use this to build whitelist filters for form inputs, extract log lines that contain specific codes, or define patterns to match database entries. It’s especially useful when you’re handling user-generated lists and need fast, clean regex on the fly.

Useful Tools & Suggestions:

After using Generate Regex from Integers, try Generate Integers from a Regex to test if your pattern matches what you expect. And if you’re working with results, Highlight Integers can help visualize which values match the expression.

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