int Find (string string, string charset)
The zero-based index of the first character in this string
that is also in charset;
–1 if there is no match.
string – string to
charset – string
containing characters for matching.
Searches this string for the first character that matches
any character contained in charset.
The following example demonstrates the use of
string s = "abcdef"
int nPos = FindOneOf(s, "xd")