/(      # start selection
    \w{3} # Tue
    \s    # one space
    \w{3} # Sep
    \s+   # one or more spaces
    \d+   # 5 (day, one or more digits)
    \s    # one space
    \d+:\d+:\d+ # 10:26:44
    \s+   # one or more spaces
    (?:\w+\s+)? # optional timezone GMT
    \d+   # year
   )      # end of selection
  /x      # x - allows whitespace in regexp