content: package jackmego.com.jieba_android;
  
  import java.util.regex.Pattern;
  
  
  public class CharacterUtil {
      public static Pattern reSkip = Pattern.compile("(\\d+\\.\\d+|[a-zA-Z0-9]+)");
      private static final char[] connectors = new char[] { '+', '#', '&', '.', '_', '-' };
  
  
      public static boolean isChineseLetter(char ch) {
          if (ch >= 0x4E00 && ch <= 0x9FA5)
              return true;
          return false;
      }
  
  
      public static boolean isEnglishLetter(char ch) {
          if ((ch >= 0x0041 && ch <= 0x005A) || (ch >= 0x0061 && ch <= 0x007A))
              return true;
          return false;
      }
  
  
      public static boolean isDigit(char ch) {
          if (ch >= 0x0030 && ch <= 0x0039)
              return true;
          return false;
      }
  
  
      public static boolean isConnector(char ch) {
          for (char connector : connectors)
              if (ch == connector)
                  return true;
          return false;
      }
  
  
      public static boolean ccFind(char ch) {
          if (isChineseLetter(ch))
              return true;
          if (isEnglishLetter(ch))
              return true;
          if (isDigit(ch))
              return true;
          if (isConnector(ch))
              return true;
          return false;
      }
  
  
      /**
       * 全角 to 半角,大写 to 小写
       * 
       * @param input
       *            输入字符
       * @return 转换后的字符
       */
      public static char regularize(char input) {
          if (input == 12288) {
              return 32;
          }
          else if (input > 65280 && input < 65375) {
              return (char) (input - 65248);
          }
          else if (input >= 'A' && input <= 'Z') {
              return (input += 32);
          }
          return input;
      }
  
  }
  