trex home age has:
T-Rex is a minimalistic regular expression library written in ANSI C,
supports the following POSIX expressions: ?,*,+,^,$,.,[a-b],() plus the
perl style greedy closures {n} .
does this mean that a list of chars in [] is not supported, e.g.,
one of finnish emergency number rules:
^0[235689]112
-- juha