Don't allow [] characters in patterns

parse.go

@@ -171,7 +171,7 @@ func isAlphanumeric(ch rune) bool {
 // isPatternChar matches characters that are allowed in patterns
 func isPatternChar(ch rune) bool {
 	switch ch {
-	case '*', '?', '.', '/', '@', '_', '+', '-', '[', ']', '\\':
+	case '*', '?', '.', '/', '@', '_', '+', '-', '\\':
 		return true
 	}
 	return isAlphanumeric(ch)

parse_test.go

@@ -52,9 +52,9 @@ func TestParseRule(t *testing.T) {
 		},
 		{
 			name: "complex patterns",
-			rule: "[d]?r/* @user",
+			rule: "d?r/* @user",
 			expected: Rule{
-				pattern: mustBuildPattern(t, "[d]?r/*"),
+				pattern: mustBuildPattern(t, "d?r/*"),
 				Owners:  []Owner{{Value: "user", Type: "username"}},
 			},
 		},
@@ -92,6 +92,11 @@ func TestParseRule(t *testing.T) {
 			rule: "file.{txt @user",
 			err:  "unexpected character '{' at position 6",
 		},
+		{
+			name: "patterns with brackets",
+			rule: "file.[cC] @user",
+			err:  "unexpected character '[' at position 6",
+		},
 		{
 			name: "malformed owners",
 			rule: "file.txt missing-at-sign",