match regex character to function call

Question

I am working in C#

I want to be able to call a function on a specific character in my regular expression language and was wondering if this was possible. For example if I have my pattern as ^[0-9]*$ I would like to call the function foo() when a 7 is found. So if I had the string "0129384927377" it would call the function foo three times.

Any way of doing this?

If you want context I'm trying to build a DPDA (Deterministic Pushdown Automaton) as simply as possible and not sure the best way of doing it.

Answer 1

Like this:

Regex.Matches("0129384927377","7").Count