Repetition

start:        die  /^\Z/

die:          number(?) 'd' number

number:       /\d+/

• Items can have repetition specifiers
  • item(?) Match one or zero times.
  • item(s) Match one or more times.
  • item(s?) Match zero or more times.
  • item(N) Match exactly N time.
  • item(N..M) Match at least N times, at most M times.
  • item(..M) Match at least once, at most M times.
  • item(N..) Match at least N times.
• Return value is a array ref, with the matched items as elements.