c#中字符串的反转部分

Question

如何反转用户输入字符串的一部分？只有数字不应该反转所有其他部分必须反转。

ABC123DEF   --> CBA123FED
DISK0123CAR --> KSID0123RAC
596ABCDEF   --> 596FEDCBA

提前致谢这是我的代码：

public static string ReverseStr(string sStrRev)
{
        string output = "";
        Dictionary<int, char> SChar = new Dictionary<int, char>();

        int Cposition = 0;

        for (int i = sStrRev.Length - 1; i >= 0; i--)
        {
            if (sStrRev[i] != '1' && sStrRev[i] != '2' && sStrRev[i] != '3' 
                && sStrRev[i] != '4' && sStrRev[i] != '5' 
                && sStrRev[i] != '6' && sStrRev[i] != '7' 
                && sStrRev[i] != '8' && sStrRev[i] != '9' 
                && sStrRev[i] != '0')
                output += sStrRev[i];
            else
            {
                SChar.Add(Cposition, sStrRev[i]);
            }
            Cposition++;
        }

        for (int i = 0;i<sStrRev.Length ; i++)
        {
            if (SChar.ContainsKey(i))
                output.Insert(i, SChar[i].ToString());
        }
            return output;
 }

Answer 1

我建议使用正则表达式来匹配所有要反转的部分，并使用Linq来反转它们：

  using System.Linq;
  using System.Text.RegularExpressions; 

  ...

  string source = "DISK0123CAR"; 

  // KSID0123RAC 
  string result = Regex.Replace(source, 
    "[^0-9]+",                                        // all except numbers ...
     match => string.Concat(match.Value.Reverse()));  // ... should be reversed

如果你想把它包装成一个方法：

  public static string ReverseStr(string sStrRev) {
    // when implementing public methods do not forget to validate the input
    if (string.IsNullOrEmpty(sStrRev))
      return sStrRev;

    return Regex.Replace(sStrRev, 
      "[^0-9]+",                                        
       match => string.Concat(match.Value.Reverse())); 
  }

编辑：请注意解决方案不交换块：

  ABC123DEF   --> CBA123FED    // <- CBA and FED are not swapped
  DISK0123CAR --> KSID0123RAC
  596ABCDEF   --> 596FEDCBA

以防你也想颠倒区块的顺序

  string result = string.Concat(Regex
    .Split(source, "([^0-9]+)")
    .Reverse()
    .Select(chunk => chunk.All(c => c >= '0' && c <= '9') 
       ? chunk 
       : string.Concat(chunk.Reverse())));

结果会是

    ABC123DEF   --> FED123CBA    // chunks are swapped
    DISK0123CAR --> RAC0123KSID
    596ABCDEF   --> FEDCBA596

c#中字符串的反转部分

reverse part of string in c#

c#

string

reverse