Text Extractor via Regular Expressions
Extract matching text using regular expressions and capture groups, output to CSV.
Regular expression extraction is a powerful technique for pulling structured data from unstructured text. This tool applies user-defined regex patterns to text input and extracts all matches into a clean CSV. You can use capture groups to extract specific parts of each match, producing multiple columns from a single regex pattern. The tool is useful for extracting structured data from log files, error messages, configuration output, or any text with repeating patterns. You paste your text, enter a regex pattern, and the tool outputs a CSV with one row per match and columns for each capture group. The regex engine uses JavaScript standard syntax, supporting character classes, quantifiers, lookaheads, and backreferences. All processing runs in your browser, making it safe for extracting patterns from sensitive log files, server output, or confidential documents.
How to use the Regex Extractor tool
- Load your text: Drag and drop a text file, choose a file from your file explorer, or paste text directly into the paste area.
- Write a regex pattern: Enter a regular expression pattern to match (e.g. (\w+):\s*(\d+)). Use capture groups to extract specific parts.
- Configure flags: Toggle Ignore Case for case-insensitive matching and Multiline to make ^ and $ work across lines.
- Choose output format: Select CSV (capture groups become columns) or Plain List (matching strings only).
- Extract matches: Click the "Extract Matches" button to find all matching text, then copy or download the results.