string input = " xx xxn ";
Console.WriteLine("操作前input={0},长度={1}",input,input.Length); //去除重复空格,连续空格替换为单个空格
input = Regex.Replace(input.Trim(), "\\s+", " ");
Console.WriteLine("操作后input={0},长度={1}", input, input.Length);
string input = " xx xxn ";
Console.WriteLine("操作前input={0},长度={1}",input,input.Length); //去除重复空格,连续空格替换为单个空格
input = Regex.Replace(input.Trim(), "\\s+", " ");
Console.WriteLine("操作后input={0},长度={1}", input, input.Length);