Added more test cases

re_test.go

@@ -255,6 +255,16 @@ var reTests = []struct {
 	{`\Bz`, nil, `xyz`, []Group{{2, 3}}},
 	{`z\B`, nil, `xyz`, []Group{}},
 	{`\Bx`, nil, `xyz`, []Group{}},
+	{`\Ba\B`, nil, `a-`, []Group{}},
+	{`\Ba\B`, nil, `-a`, []Group{}},
+	{`\Ba\B`, nil, `-a-`, []Group{}},
+	{`\By\B`, nil, `xy`, []Group{}},
+	{`\By\B`, nil, `yz`, []Group{}},
+	{`\By\b`, nil, `xy`, []Group{{1, 2}}},
+	{`\by\B`, nil, `yz`, []Group{{0, 1}}},
+	{`\By\B`, nil, `xyz`, []Group{{1, 2}}},
+	{`ab|cd`, nil, `abc`, []Group{{0, 2}}},
+	{`ab|cd`, nil, `abcd`, []Group{{0, 2}, {2, 4}}},
 
 	// Todo - add numeric range tests
 }
@@ -285,6 +295,9 @@ var groupTests = []struct {
 	{"(a?)a?", nil, "aa", []Match{[]Group{{0, 2}, {0, 1}}, []Group{{2, 2}, {2, 2}}}},
 	{"a((b.d){3})", nil, "abfdbhdbid", []Match{[]Group{{0, 10}, {1, 10}, {7, 10}}}},
 	{`(a)(b)(c)(d)(e)(f)(g)(h)(i)(j)(k)(l)\071`, nil, `abcdefghijkl9`, []Match{[]Group{{0, 13}, {0, 1}, {1, 2}, {2, 3}, {3, 4}, {4, 5}, {5, 6}, {6, 7}, {7, 8}, {8, 9}, {9, 10}, {10, 11}, {11, 12}}}},
+	{`()ef`, nil, `def`, []Match{[]Group{{1, 3}, {1, 1}}}},
+	{`(?:)ef`, nil, `def`, []Match{[]Group{{1, 3}}}},
+	{`(?:)`, nil, `def`, []Match{[]Group{{0, 0}}, []Group{{1, 1}}, []Group{{2, 2}}}},
 }
 
 func TestFindAllMatches(t *testing.T) {