Subrules may also be specified with a trailing repetition specifier, indicating that they are to be (greedily) matched the specified number of times. The available specifiers are:

subrule(?)      # Match one-or-zero times
subrule(s)      # Match one-or-more times
subrule(s?)     # Match zero-or-more times
subrule(N)      # Match exactly N times for integer N > 0
subrule(N..M)   # Match between N and M times
subrule(..M)    # Match between 1 and M times
subrule(N..)    # Match at least N times
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