nth出现在字符串中的od字符 [英] nth occurence od character in a string

问题描述

如何在不使用LINQ的情况下找到字符串中第n个字符的出现

How to find nth occurence of a character in a string without using LINQ

推荐答案

你有没有尝试过？



这将是一个简单的for循环if。类似于：

Did you try anything?

It would be a simple for loop with an if. Something like:

public int GetNthOccurenceIndex(string sample, char t, int nth)
{
    int count = 0;
    for (int i = 0; i < sample.Length; i++)
    {
        if (sample[i] == t)
        {
            count++;
            if (count == nth)
               return i;
        }
    }
    // -1 means nth occurrence was not found.
    return -1;
}

MatchCollection mc = Regex.Matches（strList，c.ToString（））;

if（mc .Count> = numCount）

result = mc [numCount - 1] .Index;

MatchCollection mc = Regex.Matches(strList, c.ToString());
if (mc.Count >= numCount)
result = mc[numCount - 1].Index;

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