控制字符

• Matches unicode control characters such as tab and newline
  匹配类似tab和newline这样的unicode控制字符。
• Background colour control character
  背景彩色控制字符
• Formatting control character such as the bi - directional control characters
  格式控制字符，例如双向控制字符。
• If 1 is specified , the control characters are replaced by a single space
  如果指定了1 ，则控制字符被一个空格替代。
• Character , transmission control
  传输控制字符
• The last line removes any control characters that may exist in the file
  最后一行除去文件中可能存在的任何控制字符。
• Any non - control character
  任何非控制字符。
• Control character , separating
  分隔控制字符
• Accuracy control character
  准确度控制字符
• Character , print control
  印字控制字符