var s = "Hello there, 1+1 should be 2. And 5-2 will be 3.";
s = s.replace(/([0-9*/+\-()]+)/gi, function($0, $1) { return eval($1) });
Debug.Trace(s);
did the trick
now im able to do some more advanced stuff upon those expressions that are found...
also not-find simple chars... when i write a bare number, it is eval'ed so i gotta fix this