Find Patterns in Integers

Find Patterns in Integers makes it easy to search for specific digit patterns within a list of numbers. You can do a simple match (like find all lines containing “123”) or use regular expressions for more flexible matching. It supports toggles for case sensitivity and whole-line matching, so you can really dial in what you’re looking for.

It works with pasted text or imported files, and everything updates live as you type or adjust options. Like all tools here, it runs entirely in your browser nothing gets uploaded, and everything stays local.

Paste your input above or import a file below.
No file chosen
Supported file types: .txt, .csv, .tsv, .log, .json, .xml, .md, .ini, .yaml, .yml, .html, .htm, .css
Total matches: 0
Options
Case sensitive
Whole match only
Maximize output

How to Use:

  • Paste or type numbers into the Input Integers box.
  • Or click Choose File to import .txt, .csv, or other plain-text files.
  • Enter a pattern in the search field (e.g., 23, ^123, or [5-9]{2}).
  • Choose your Match mode:
    • Plain Match: looks for exact text
    • Regex Match: treats the pattern as a regular expression
  • Use the toggles:
    • Case sensitive: makes pattern matching respect upper/lowercase
    • Whole match only: restricts to full-line matches
    • Maximize output: expands the output box
  • The output updates live no need to click anything.
  • Click Copy Output to copy the matches.
  • Click Export to File to save them.
  • Use Clear All to reset everything.

What Find Patterns in Integers can do:

  • Match simple digit sequences or complex patterns using regex.
  • Highlight exact matches or filter entire matching lines.
  • Toggle case sensitivity and whole-line enforcement.
  • Import numeric data from local files processed instantly in-browser.
  • Show live output with flashing feedback and a match counter.
  • Maximize the result view with one click.
  • Copy and export matched lines easily.
  • No uploads completely private and secure.

Example:

Input:

1024
54321
-7890
12345

Pattern: 23Match mode: PlainOutput:

12345

Pattern: ^[1-5]{5}$ Match mode: Regex Output:

54321
12345

Common Use Cases:

This tool is perfect when you’re scanning through number lists looking for specific sequences like checking for IDs, identifying corrupted data, or spotting numeric trends. Whether you’re working with logs, test cases, or CSVs full of integers, it gives you a fast way to filter exactly what you need.

Useful Tools & Suggestions:

After using Find Patterns in Integers, try Analyze Integers to dig deeper into structure and distribution. And if you want to visualize those patterns, Color Integer Digits can make recurring shapes or sequences stand out fast.

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