Filter Text Lines

Find and extract lines containing specific text (Grep). Filter logs, lists, and code instantly with Regex support.

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Real-time

Instantly filters thousands of lines as you type. No waiting.

Regex Power

Full JavaScript Regular Expression support for advanced filtering.

Secure

All processing happens in your browser. Data never leaves your device.

Try These Examples

Find "Error" Logs

Extract only lines containing error messages.

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Remove Comments

Remove lines containing comments (Grep -v).

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Find Emails (Regex)

Extract lines with email addresses using Regex.

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Whole Word Search

Match exact word "apple", ignoring "pineapple".

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Ultimate Guide: Filter Text Lines (Grep)

The Filter Text Lines tool is a powerful utility that brings the functionality of the command-line grep tool to your browser. It allows developers, data analysts, and writers to search through large text files and extract exactly what they need.

For Developers

Quickly isolate error logs from massive log files. Extract specific API endpoints from documentation. Use Regex to find complex patterns like email addresses or IP addresses within code.

For Data Analysis

Filter CSV data by specific columns or values. Clean up datasets by removing unwanted lines (using Invert Match). Prepare data for import by extracting only relevant rows.

Pro Tip: Invert Match

Sometimes it's easier to say what you don't want. Use the Invert Match option (equivalent to grep -v) to remove lines that contain specific noise, leaving you with the clean data you need.