Question 1

What does a regex extractor do?

Accepted Answer

A regex extractor scans your text for every match of a regular expression pattern and lists them — unlike a tester that just shows pass/fail, an extractor pulls out the actual matched substrings, including capture groups, with line numbers and totals.

Question 2

What regex flavor does this use?

Accepted Answer

It uses JavaScript's built-in RegExp engine (the same one browsers use). This is the same flavor supported in JS code, modern Node.js, VS Code search and most front-end tools. The four common flags are g (global), i (case-insensitive), m (multiline) and s (dotAll).

Question 3

What are common regex extractor use cases?

Accepted Answer

Extracting every email address, URL, phone number, IP address, hex color, hashtag, date, or price from a large block of text. Also great for log parsing, scraping data out of HTML, pulling IDs from CSV files and turning unstructured text into clean lists.

Question 4

Can I extract capture groups?

Accepted Answer

Yes. Wrap parts of your pattern in parentheses — for example (\w+)@(\w+\.\w+) for an email — and the tool shows both the full match and each captured group, so you can pull out the username and domain separately.

Question 5

Is my text private?

Accepted Answer

Yes. The extraction runs 100% in your browser using JavaScript's built-in RegExp. Your text and patterns are never uploaded to any server or stored anywhere.