Text Line Extractor
About this Tool
The Text Line Extractor on AllThatConverter is a high-performance web utility that isolates and extracts specific rows from large text files or raw logs based on search keywords or regular expressions (RegEx). Functioning identically to Linux grep and grep -v commands, it provides instant Top 100 lines preview with line numbers, one-click clipboard copying, and full text file export. Everything executes 100% locally in your browser sandbox, keeping sensitive server logs strictly confidential.
Processed safely on your device
Everything happens in your browser on this device. Your files are never sent to our servers—so you can use it with peace of mind.
How to Use
Upload your text file (.txt, .log, .csv, etc.) via drag & drop, or click 'Load Sample File' for a quick demonstration.
Enter your target search keyword or regular expression pattern.
Toggle optional matching parameters: 'Use Regular Expression (Regex)', 'Case Sensitive', or 'Exclude Matching Lines (Invert Search)'.
Click the 'Extract Lines' button, inspect the top lines preview with line numbers, and choose 'Copy to Clipboard' or 'Download Full File'.
Key Scenarios & Use Cases
Server Log Debugging (Nginx, Docker, Spring)
Quickly extract critical entries containing 'ERROR', 'Exception', or '500' status codes from multi-megabyte server logs to accelerate root-cause analysis.
RegEx Pattern Extraction (Emails, IPs, URLs)
Filter unstructured text streams to gather matching records such as email formats, IPv4/IPv6 addresses, or specific ISO timestamp strings.
Inverted Matching & Comment Sweeping
Enable inverted matching to eliminate code comments (//, #) or empty tags in bulk, extracting only meaningful content payloads.
Data Filtering from Massive CSV/TSV Files
Extract data rows that contain specific customer IDs, product SKUs, or geographic codes without needing heavy spreadsheet software.
Frequently Asked Questions (FAQ)
Check the 'Use Regular Expression (Regex)' option to unlock standard JavaScript RegEx syntax. For instance, `^ERROR` matches lines starting with ERROR, and `.*@company\.com` matches specific corporate email rows.
Yes! Standard extraction behaves like `grep`, while 'Exclude Matching Lines' functions like `grep -v` (invert match). Enabling Regex provides the power of `grep -E` (egrep) directly in your browser.
No. The result section renders a lightweight Top 100 lines preview with line numbers to prevent DOM lag, while enabling you to download or copy the entire filtered dataset seamlessly.
100% safe. All file reading, RegEx matching, and export logic occur strictly within your client-side browser runtime. No data is ever transmitted to external web servers.