http:\\\\www.baidu.com\r\nhttp:\\\\www.google.com\r\nhttp:\\\\www.sina.com\r\n
=>http:\\www.baidu.com http:\\www.google.com http:\\www.sina.comstring xx = "http:\\\\www.baidu.com\r\nhttp:\\\\www.google.com\r\nhttp:\\\\www.sina.com\r\n ";
xx = xx.Replace("\\\\", "\\");
=>http:\\www.baidu.com http:\\www.google.com http:\\www.sina.comstring xx = "http:\\\\www.baidu.com\r\nhttp:\\\\www.google.com\r\nhttp:\\\\www.sina.com\r\n ";
xx = xx.Replace("\\\\", "\\");
不为空的就是的