Yet another regex to check URLs

gistfile1.txt

# Capture entire matched URL
(
    # Optional: only allow some network protocols
    # URL protocol and a colon followed by 2 slashes
    (?:
        (?:
            http|https|ftp
        ):\\/\\/
    )?

    # Check if it is the beginning of a word
    (?<=\\b)

    # The URL must not start with the character '@'
    (?<!\\@)

    # The domain name must begin with a valid character
    (?:[\w\d]

        # Other characters allowed in the domain
        (?:[\w\dñÑ()+,-.:=;$_!*'%?#])*
    )

    # A recognized domain is required
    \\.
    (?:
        aero|arpa|asia|biz|cat|com|coop|edu|gov|inet|info|int|jobs|mil|
        mobi|museum|name|net|org|pro|tel|travel|xxx|ac|ad|ae|af|ag|ai|
        al|am|an|ao|aq|ar|as|at|au|aw|az|ba|bb|bd|be|bf|bg|bh|bi|bj|bm|bn|
        bo|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|cr|cu|
        cv|cx|cy|cz|de|dj|dk|dm|do|dz|ec|ee|eg|er|es|et|eu|fi|fj|fk|fm|fo|
        fr|ga|gb|gd|ge|gf|gg|gh|gi|gl|gm|gn|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|
        hn|hr|ht|hu|id|ie|il|im|in|io|iq|ir|is|it|je|jm|jo|jp|ke|kg|kh|ki|
        km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|me|
        mg|mh|mk|ml|mm|mn|mo|mp|mq|mr|ms|mt|mu|mv|mw|mx|my|mz|na|nc|ne|nf|
        ng|ni|nl|no|np|nr|nu|nz|om|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|ps|pt|pw|
        py|qa|re|ro|rs|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl|sm|sn|so|sr|
        st|su|sv|sy|sz|tc|td|tf|tg|th|tj|tk|tl|tm|tn|to|tp|tr|tt|tv|tw|tz|
        ua|ug|uk|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|za|zm|zw
    )

    # Optional: Port number
    (?::[0-9]+)?

    # Characters allowed in a URL according to RF1738
    (?:
        \\/[\w\d()+,-.:=@;$_!*'%?#&|\\\\]*
    )*

    # Check if we have consumed all characters allowed in a URL
    (?![\w\d()+,-./:=@;$_!*'%?#&|\\\\])
)