Filter Lines Containing

Paste text and a search term to keep only the lines that match — supports plain text, case-insensitive, and regex modes.

Use the Filter Lines Containing

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Summary

Filter Lines Containing scans a block of text line by line and returns only those lines that match your search term. It works like a lightweight browser-side grep with plain, case-insensitive, and regular-expression modes. Processing happens entirely in your browser — no text is ever uploaded.

How it works

  1. Paste or type the text you want to filter into the Input box.
  2. Enter the word, phrase, or regex pattern in the Search field.
  3. Choose a match mode: plain (default), case-insensitive, or regex.
  4. Click Filter Lines — matching lines appear instantly in the Output box.
  5. Copy the result with the Copy button or clear both fields to start over.

Use cases

  • Extract all error lines from a log file.
  • Pull every line containing a specific domain from an access log.
  • Filter CSV rows that include a particular value.
  • Isolate lines matching a regex pattern in config files.
  • Find all TODO comments copied from source code.
  • Narrow down large text output from command-line tools.
  • Extract email addresses or URLs embedded in multi-line text.
  • Filter only lines that contain a specific IP address range.

Frequently Asked Questions

Last updated: 2026-05-23 · Reviewed by Nham Vu