How pulling emails out of text actually works
How a pattern finds addresses in raw text, why a strict rule beats a permissive one, and the obfuscated forms an extractor cannot catch.
What counts as a match
An email address has a predictable shape: some allowed characters, an at sign, a domain made of dot-separated labels, and a top-level domain like com or io. The extractor looks for exactly that shape anywhere in your text and lifts it out. It does not understand the meaning of the surrounding words, so it happily finds an address buried in a log line, a CSV cell or a paragraph of prose. Anything that does not fit the shape, such as a Twitter handle or a bare domain, is simply ignored.
Why strict beats permissive
The official email specification allows some genuinely strange addresses, including quoted spaces and comments in parentheses. Matching all of that in free text produces a flood of false positives, because ordinary punctuation starts looking like part of an address. This tool uses a tighter rule than the specification on purpose. You occasionally lose an unusual but valid address, and in return you avoid dragging half a sentence into your results.
The forms it cannot catch
People hide their addresses to dodge scrapers, and those tricks defeat a pattern matcher too. Writing name (at) domain (dot) com, splitting an address across HTML tags, or rendering it as an image all break the shape the tool searches for. Internationalized addresses that use non-Latin letters and rare IP-literal domains such as user@[192.168.0.1] also fall outside the rule. If an address is deliberately disguised, expect to reassemble it by hand.
Cleaning a scraped list
Raw extraction is only the first step. A page or export often repeats the same address many times, so Remove duplicates trims the list down to unique contacts while keeping the first spelling it saw. Sorting then makes it easy to scan for typos or near-duplicate domains. Remember that a clean, well-formatted list is still not a verified one, so run the results through a real validation or mailing service before you send anything important.