Can i use regex to find the index of X?

Question

I have a big string, and want to find the first occurrence of X, X is \"numberXnumber\"... 3X3, or 4X9...

How could i do this in C#?

Answer 1

For those who love extension methods:

public static int RegexIndexOf(this string str, string pattern)
{
    var m = Regex.Match(str, pattern);
    return m.Success ? m.Index : -1;
}