An interval expression, \{m,n\} where m and n are
non-negative integers with n >= m, applies to the preceeding
character, character set, subexpression or backreference. It indicates
that the preceeding element must match at least m times and may
match as many as n times.
For example:
c\([ad]\)\{1,4\}
matches
car cdr caar cdar ... caaar cdaar ... cadddr cddddr
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