Flowdock
[](p1) public

Return the n-th subgroup in the most recent match.

  s = StringScanner.new("Fri Dec 12 1975 14:39")
  s.scan(/(\w+) (\w+) (\d+) /)       # -> "Fri Dec 12 "
  s[0]                               # -> "Fri Dec 12 "
  s[1]                               # -> "Fri"
  s[2]                               # -> "Dec"
  s[3]                               # -> "12"
  s.post_match                       # -> "1975 14:39"
  s.pre_match                        # -> ""
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