Regular expression to grab (most) URLs from any string, pre gTLD craze

FetchURL.regex

# Regex to grab (most) URLs from any string (except most gTLD's, but can be added manually)
# This will never be perfect (see [1]&[2]), but it does its job fair enough, currently only 2 exceptions are added (museum & travel)
#
# Capture groups:
# 1. Full URL
# 2. The protocol
# 3. Hostname+path including `www*.`
# 4. Hostname+path excluding `www*.`
# TODO: Capture group for path
#
# [1] http://en.wikipedia.org/wiki/Top-level_domain
# [2] http://newgtlds.icann.org/en/program-status/application-results/strings-1200utc-13jun12-en
/
  (
    \b
      (?:(https?|ftp):\/\/)?
        (
          (?:www\d{0,3}\.)?
          (
            [a-z0-9.-]+\.
            (?:[a-z]{2,4}|museum|travel)
            (?:\/[^\/\s]+)*
          )
        )
    \b
  )
/ix