How to find string contain only alphabets in sas

I need to find whether the string is numeric , character or alphanumeric in SAS

I tried PRXmatch but its not working

>Solution :

Try this

data have;
input String $;
datalines;
ABC    
ABC123 
1234   
;

data want(drop = a n);
   set have;
   a = anyalpha(string);
   n = anydigit(string);

   if      a and n then     Remarks = 'Alphanum ';
   else if a and not n then Remarks = 'Character';
   else if n and not a then Remarks = 'Numeric  ';
run;

Result:

String  Remarks
ABC     Character
ABC123  Alphanum
1234    Numeric