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