EH	(a+?b*)((?:a|b)+)	aaab		(0,4)(0,1)(1,4)
EH	((a+?)(b*))((a|b)+)	aaab		(0,4)(0,1)(0,1)(1,1)(1,4)(3,4)
EH	((a+?)b*)((?:a|b)+)	aaab		(0,4)(0,1)(0,1)(1,4)