fix ambiguous submatches

test.sh

@@ -96,6 +96,13 @@ qwerty.*$
 ([a-zA-Z0-9_][^1]*[a-zA-Z0-9_])|(\\\\\$([^\$]+)\\\\\$)
 (h[^1]*b)|(\\\\\$([^\$]+)\\\\\$)
 (h[^1]*b)|(\\\\\$([^\$]+)\\\\\$)
+(a|aa)*
+(a|aa)*
+(a|aa)*
+(a|aa)*
+(a|aa)*
+(a|aa)*
+(aaaa|aaa|a){3,4}
 "
 input="\
 abcdef
@@ -193,6 +200,13 @@ $\"},  /* email */
 $\"},  /* email */$
 $  hbbbb
 $ hsdhs $ 
+a
+aa
+aaa
+aaaa
+aaaaa
+aaaaaa
+aaaaaaaaaa
 "
 expect="\
 (0,3)
@@ -290,6 +304,13 @@ expect="\
 (0,18)(?,?)(0,18)(1,17)
 (3,8)(3,8)(?,?)(?,?)
 (0,9)(?,?)(0,9)(1,8)
+(0,1)(0,1)
+(0,2)(1,2)
+(0,3)(2,3)
+(0,4)(3,4)
+(0,5)(4,5)
+(0,6)(5,6)
+(0,10)(9,10)
 (0,0)
 "