Is there a function that returns index where RegEx match starts?

Question

I have strings of 15 characters long. I am performing some pattern matching on it with a regular expression. I want to know the position of the substring where the IsM

Answer 1

For multiple matches you can use code similar to this:

Regex rx = new Regex("as");
foreach (Match match in rx.Matches("as as as as"))
{
    int i = match.Index;
}