content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *    http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package org.apache.dolphinscheduler.api.utils;
  
  import org.apache.commons.lang3.StringUtils;
  
  import java.util.regex.Pattern;
  
  /**
   * This is Regex expression utils.
   */
  public class RegexUtils {
  
      private static final Pattern LINUX_USERNAME_PATTERN = Pattern.compile("^[a-zA-Z0-9_].{0,30}");
  
      private RegexUtils() {
      }
  
      /**
       * check if the input is a valid linux username
       * @param str input
       * @return boolean
       */
      public static boolean isValidLinuxUserName(String str) {
          return LINUX_USERNAME_PATTERN.matcher(str).matches();
      }
  
      public static String escapeNRT(String str) {
          // Logging should not be vulnerable to injection attacks: Replace pattern-breaking characters
          if (!StringUtils.isEmpty(str)) {
              return str.replaceAll("[\n|\r|\t]", "_");
          }
          return null;
      }
  
  }
  