Liberal URL-matching Regex, Take Two

(?xi)
\b
(                       # Capture 1: entire matched URL
  (?:
    [a-z][\w-]+:            # URL protocol and colon
    (?:
      /{1,3}                    # 1-3 slashes
      |                         #   or
      [a-z0-9%]                 # Single letter or digit or '%'
                                # (Trying not to match e.g. "URI::Escape")
    )
    |                       # or
    www\d{0,3}[.]               # "www.", "www1.", "www2." … "www999."
  )
  (?:                       # One or more:
    [^\s()<>]+                  # Run of non-space, non-()<>
    |                           #   or
    \([^\s()<>]+\)              # a matching set of parens
  )+
  (?:                       # End with:
    \([^\s()<>]+\)                  # a set of parens
    |                               #   or
    [^`!()\[\]{};:'".,<>?«»“”‘’\s]  # not a space or one of these punct chars
  )
)