Globstar matches zero directories

doublestar_test.go

@@ -99,7 +99,9 @@ var matchTests = []MatchTest{
 	{"[abc]", "b", true, true, nil, false, false, true, true, 3, 3},
 	{"**", "", true, true, nil, false, false, false, false, 38, 38},
 	{"a/**", "a", true, true, nil, false, false, false, true, 7, 7},
+	{"a/**/", "a", true, true, nil, false, false, false, false, 4, 4},
 	{"a/**", "a/", true, true, nil, false, false, false, false, 7, 7},
+	{"a/**/", "a/", true, true, nil, false, false, false, false, 4, 4},
 	{"a/**", "a/b", true, true, nil, false, false, false, true, 7, 7},
 	{"a/**", "a/b/c", true, true, nil, false, false, false, true, 7, 7},
 	{"**/c", "c", true, true, nil, !onWindows, false, false, true, 5, 4},

match.go

@@ -301,9 +301,14 @@ MATCH:
 }
 
 func isZeroLengthPattern(pattern string, separator rune) (ret bool, err error) {
-	// `/**` is a special case - a pattern such as `path/to/a/**` *should* match
-	// `path/to/a` because `a` might be a directory
-	if pattern == "" || pattern == "*" || pattern == "**" || pattern == string(separator)+"**" {
+	// `/**`, `**/`, and `/**/` are special cases - a pattern such as `path/to/a/**` or `path/to/a/**/`
+	// *should* match `path/to/a` because `a` might be a directory
+	if pattern == "" ||
+		pattern == "*" ||
+		pattern == "**" ||
+		pattern == string(separator)+"**" ||
+		pattern == "**"+string(separator) ||
+		pattern == string(separator)+"**"+string(separator) {
 		return true, nil
 	}