1 Regexp: a|b(d|e(g|h|i)|f)|c 2 a: Ok 3 c: Ok 4 bd: Ok 5 bf: Ok 6 beg: Ok 7 beh: Ok 8 bei: Ok 9 b: Fail 10 be: Fail 11 bi: Fail 12 f: Fail 13 ab: Fail 14 ac: Fail 15
