C# 标点符号在字符串中出现的位置

Question

本帖最后由 satdown 于 2012-06-08 16:37:50 编辑

Answer 1

string s = "xxxxxx,xxxxxx,xxxxxxxx。xxxxxxxx。xxxxxxxxx;xxxxx!xxxxxx!";MessageBox.Show(s.IndexOf(',').ToString());
MessageBox.Show(s.LastIndexOf(',').ToString());
……

Answer 2

string s = "xxxxxx,xxxxxx,xxxxxxxx。xxxxxxxx。xxxxxxxxx;xxxxx!xxxxxx!";
List<int> position = new List<int>();
int index = -1;
while ((index = s.IndexOf(',', index + 1)) >= 0)
{
    position.Add(index);
}

Answer 3

如需加标点符号，请在pattern正则表达式中的中括号内 string tempStr = "xxxxxx,xxxxxxxx,xxxxxxxx。xxxxxxxx。xxxxxxxxx;xxxxx!xxxxxx!";
                string pattern = @"[,。!]";                var data = Regex.Matches(tempStr, pattern).Cast<Match>().Select((a ,i)=> new { desc=a.Value,index=a.Index});
                /*
                 * + [0] { desc = ",", index = 6 } <Anonymous Type>
                   + [1] { desc = ",", index = 15 } <Anonymous Type>
                   + [2] { desc = "。", index = 24 } <Anonymous Type>
                   + [3] { desc = "。", index = 33 } <Anonymous Type>
                   + [4] { desc = "!", index = 49 } <Anonymous Type>
                   + [5] { desc = "!", index = 56 } <Anonymous Type>                 */

Answer 4

 class Program
    {
        static void Main(string[] args)
        {
            string s = "xxxxx,xxxxxxx,xxxxxxx.xxxxxxx.xxxxxxxx;xxxxx!xxxxx!";
            
            for (int i = 0; i < s.Length; i++)
            {
                switch (s[i])
                {
                    case ',':
                        Console.WriteLine("The position of ',' is {0}: ", i);
                        break;
                    case '.':
                        Console.WriteLine("The position of '.' is {0}: ", i);
                        break;
                    case '!':
                        Console.WriteLine("The position of '!' is {0}: ", i);
                        break;
                    default: break;
                }
            }
        }
    }

Answer 5

while循环里面从index+1位置开始找下一个','的位置，初始的时候肯定得从0开始，所以index的初始值要赋为-1