our)
    (:) \d{2}                       # (minute)
    (:) \d{2}                       # (second)
    (?: (\.)\d*)?                   # (fraction)
    [ \t]*
    (?:
      Z | [-+] \d{1,2} (?: (:)\d{1,2})?
    )?                              # (time zone)
)