Filter a List of Numbers

Filter a List of Numbers by matching part of each line. You can choose to either keep or remove lines that match your filter. It works with plain text or regular expressions, and you get live updates as you type.

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 items: 0
Options
Use regex
Case sensitive

How to Use:

  1. Paste one number per line into the input box.
  2. Or use “Choose File” to import from a plain-text file.
  3. In Options:
    • Choose whether to keep or remove matches.
    • Toggle “Use regex” for advanced matching.
    • Toggle “Case sensitive” if needed.
    • Enter your filter in the input box.
  4. The output updates live and flashes to confirm changes.
  5. Copy or export your filtered result from the output box.

What Filter a List of Numbers can do:

This tool reads your input line-by-line, then applies your filter to each one. You can keep or drop matches depending on your mode. You’ve got full control over whether the filter uses plain text or regex, and whether casing matters. Live counts let you know how many lines made it through.

Example:

Input:

123
456
789
204
42
101

With Options: Remove matching ✓, Filter: 4, Use regex ✗, Case sensitive ✗

Output:

123
789
101

Common Use Cases:

Great for slicing out invalid values, cleaning bulk lists, or extracting patterns from a huge dataset. Whether you’re working with IDs, logs, or numeric strings this saves you time and filters fast.

Useful Tools & Suggestions:

Once you’ve narrowed things down, Find Unique List Items can help you spot what stands out. And if you’re doing prep work, Delete Empty List Items keeps your data tight and ready to go.

Related Tools