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Regexp: a{2,3}
a: Fail
aa: Ok
aaa: Ok
aaaa: Fail
Regexp: ba{2,3}c
bac: Fail
baac: Ok
baaac: Ok
baaaac: Fail
Regexp: a(b|c){2,3}d
abcd: Ok
acccd: Ok
abd: Fail
accccd: Fail