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

Did you try anything?

It would be a simple for loop with an if. Something like:
C#
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;
}
   
v2
MatchCollection mc = Regex.Matches(strList, c.ToString());
if (mc.Count >= numCount)
result = mc[numCount - 1].Index;
   

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