I'm assuming that a host name can't start with whitespace, or even contain whitespace, and annot contain a colon. I'm also assuming a default value of 80 for the port number.

Just for this example, I'm assuming that string is in $_. 

my($host, $port) = /^Host:\s*([^:\s]+)(?:\:(\d+))?/i;
$port = 80 if not defined $port;

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You see, if the ":7799" part is missing, $2 (= the value assigned to $port) will be undef. And then, I assign 80 to it.

In reply to Re: Parse hostname from HTML header string by bart
in thread Parse hostname from HTML header string by JoeJaz

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