#1	aa*			xaxaax	(1,2)
#2	(a*)(ab)*(b*)		abc	(0,2)(0,1)(?,?)(1,2)
#-2	(a*)(ab)*(b*)		abc	(0,2)(0,0)(0,2)(2,2)
3	((a*)(ab)*)((b*)(a*))	aba	(0,3)(0,2)(0,0)(0,2)(2,3)(2,2)(2,3)
#4	(...?.?)*		xxxxxx	(0,6)(4,6)
#5	(a|ab)(bc|c)		abcabc	(0,3)(0,2)(2,3)
6	(aba|a*b)(aba|a*b)	ababa	(0,5)(0,2)(2,5)
#7	(a*){2}			xxxxx	(0,0)(0,0)
8	(a*)*			a	(0,1)(0,1)
9	(aba|a*b)*		ababa	(0,5)(0,2)(2,5)
10	(a(b)?)+		aba	(0,3)(0,2)(1,2)(2,3)
11	.*(.*)			ab	(0,2)(2,2)
#12	(a?)((ab)?)(b?)a?(ab)?b?	abab	(0,4)(0,1)(1,1)(?,?)(1,2)(?,?)
-12	(a?)((ab)?)(b?)a?(ab)?b?	abab	(0,4)(0,0)(0,2)(0,2)(2,2)(2,4)