Hit send too soon. My formula solution would need to be modified to do
that:

=IF(A1<"",NOT(ISNA(LOOKUP(9.9+307,--MID(A1,MIN(SEARCH({0,1,2,3,4,5,6,7,8,9},
A1&"0123456789")),ROW(INDIRECT("1:"&LEN(A1))))))) )

Here is a slightly shorter formula I came up with to do this...

=SUMPRODUCT(--ISNUMBER(FIND(MID(A1,ROW(INDIRECT("A1:A"&LEN(A1))) ,1),"1234567890")))0

What the SUMPRODUCT part is doing is summing up all the digits in A1, so
seeing if that is greater than zero gives the result the OP asked for.

What the SUMPRODUCT part is doing is **counting** up the number of digits...

Rick