fix regex error

apollo-common/src/main/java/com/ctrip/framework/apollo/common/utils/InputValidator.java

@@ -11,8 +11,8 @@ import java.util.regex.Pattern;
 public class InputValidator {
   public static final String INVALID_CLUSTER_NAMESPACE_MESSAGE = "只允许输入数字，字母和符号 - _ .";
   public static final String INVALID_NAMESPACE_NAMESPACE_MESSAGE = "不允许以.json, .yml, .yaml, .xml, .properties结尾";
-  public static final String CLUSTER_NAMESPACE_VALIDATOR = "[0-9a-zA-z_.-]+";
-  public static final String APP_NAMESPACE_VALIDATOR = "[a-zA-z0-9._-]+(?<!\\.(json|yml|yaml|xml|properties))$";
+  public static final String CLUSTER_NAMESPACE_VALIDATOR = "[0-9a-zA-Z_.-]+";
+  public static final String APP_NAMESPACE_VALIDATOR = "[a-zA-Z0-9._-]+(?<!\\.(json|yml|yaml|xml|properties))$";
   private static final Pattern CLUSTER_NAMESPACE_PATTERN =
       Pattern.compile(CLUSTER_NAMESPACE_VALIDATOR);
   private static final Pattern APP_NAMESPACE_PATTERN =
@@ -28,6 +28,6 @@ public class InputValidator {
     if (StringUtils.isEmpty(name)){
       return false;
     }
-    return CLUSTER_NAMESPACE_PATTERN.matcher(name.toLowerCase()).matches() && APP_NAMESPACE_PATTERN.matcher(name).matches();
+    return CLUSTER_NAMESPACE_PATTERN.matcher(name).matches() && APP_NAMESPACE_PATTERN.matcher(name).matches();
   }
 }