url.regex

~^

# scheme
[-a-z0-9+.]++://

# username:password (optional)
(?:
        [-a-z0-9$_.+!*\'(),;?&=%]++   # username
    (?::[-a-z0-9$_.+!*\'(),;?&=%]++)? # password (optional)
    @
)?

(?:
    # ip address
    \d{1,3}+(?:\.\d{1,3}+){3}+

    | # or

    # hostname (captured)
    (
            (?!-)[-a-z0-9]{1,63}+(?<!-)
        (?:\.(?!-)[-a-z0-9]{1,63}+(?<!-)){0,126}+
    )
)

# port (optional)
(?::\d{1,5}+)?

# path (optional)
(?:/.*)?

$~iDx