Since commit 2c3b46c ("Fix regression in handling of non-unicode characters in a plain text message"), URLs with domain names and port numbers (e.g. http://example.com:8080/path) are no longer converted into links in plain text messages.

The port number pattern (:[0-9]{1,5})? in $link_pattern was placed inside the $ip_address branch only:

(({$ip_address}(:[0-9]{1,5})?|{$utf_domain})(...))

Since : is excluded from $utf_domain, domain-name URLs stop matching at the colon and the port number is lost.

This moves (:[0-9]{1,5})? outside both branches so it applies to both IP addresses and domain names:

(({$ip_address}|{$utf_domain})(:[0-9]{1,5})?(...))

The existing test case http://link.com:test is unaffected because :test does not match [0-9]{1,5}.

Added test cases for domain-name URLs with port numbers.