Test, validate and match regular expressions
Matches HTTP or HTTPS URLs whose host consists of at least three dot-separated labels made of digits, letters, and hyphens, e.g. https://www.example.com or http://site.domain.org. An optional trailing dot plus a 1-3 character suffix (like .uk or .br) supports country-code extensions. Anchored per line with multiline flags, it validates one bare domain URL per line but does not allow paths, ports, query strings, or two-label domains like example.com.