Added more test cases

re_test.go

@@ -236,6 +236,7 @@ var reTests = []struct {
 	{`abc)`, nil, `-`, nil},
 	{`(abc`, nil, `-`, nil},
 	{`a]`, nil, `a]`, []Group{{0, 2}}},
+	{`a[]]b`, nil, `a]b`, []Group{{0, 3}}},
 
 	// Todo - add numeric range tests
 }