1Regexp: ((a|b|c)def)
2adef: Ok
3bdef: Ok
4adefg: Fail
5aaef: Fail
6Regexp: ((a|b|c|d|e|f)?(g|h|i)+(k|l)*)
7g: Ok
8gi: Ok
9fil: Ok
10gikl: Ok
11cghhhiill: Ok
12ak: Fail
13