Added more test cases

re_test.go

@@ -237,6 +237,24 @@ var reTests = []struct {
 	{`(abc`, nil, `-`, nil},
 	{`a]`, nil, `a]`, []Group{{0, 2}}},
 	{`a[]]b`, nil, `a]b`, []Group{{0, 3}}},
+	{`a[\]]b`, nil, `a]b`, []Group{{0, 3}}},
+	{`a[^bc]d`, nil, `aed`, []Group{{0, 3}}},
+	{`a[^bc]d`, nil, `abd`, []Group{}},
+	{`a[^-b]c`, nil, `adc`, []Group{{0, 3}}},
+	{`a[^-b]c`, nil, `a-c`, []Group{}},
+	{`a[^]b]c`, nil, `a]c`, []Group{}},
+	{`a[^]b]c`, nil, `adc`, []Group{{0, 3}}},
+	{`\ba\b`, nil, `a-`, []Group{{0, 1}}},
+	{`\ba\b`, nil, `-a`, []Group{{1, 2}}},
+	{`\ba\b`, nil, `-a-`, []Group{{1, 2}}},
+	{`\by\b`, nil, `xy`, []Group{}},
+	{`\by\b`, nil, `yz`, []Group{}},
+	{`\by\b`, nil, `xyz`, []Group{}},
+	{`x\b`, nil, `xyz`, []Group{}},
+	{`x\B`, nil, `xyz`, []Group{{0, 1}}},
+	{`\Bz`, nil, `xyz`, []Group{{2, 3}}},
+	{`z\B`, nil, `xyz`, []Group{}},
+	{`\Bx`, nil, `xyz`, []Group{}},
 
 	// Todo - add numeric range tests
 }