I noticed just one problem: the placement of the final question mark. The whole port part is optional, together with the colon: 
    m%  (http(?:s?))?                 # http
        (?:(?:://)? (w{0,3})\.{0,1})? # www
        ((.*)(?:\.)([^:]*))           # domains
        (?::(\d+))? %x;               # port

[download]
Edit: . changed to [^:] in # domains.
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: Perl RegEx (url explode) by choroba
in thread Perl RegEx (url explode) by U_nix$_@

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