Question 1

What email format does this tool detect?

Accepted Answer

The tool uses a regex matching the general RFC 5322 email format: local-part@domain.tld. Valid characters include letters, digits, dots, hyphens, plus signs, and underscores in the local part. Internationalized domain names (IDN) with Unicode are also detected.

Question 2

Can it extract emails from HTML source code?

Accepted Answer

Yes. Paste raw HTML and the tool extracts all email addresses, including those in mailto: links, visible text, and HTML attribute values. It does not execute scripts or decode obfuscated emails (e.g. user [at] domain [dot] com).

Question 3

Are there false positives?

Accepted Answer

Possible but rare. Valid-looking version strings (e.g. 2.0@1 is not an email) or file paths with @ symbols may be flagged. The tool produces a deduplicated list; review results before use in marketing or outreach contexts.

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