It would be hard to suggest a solution w/o knowing the capabilities of that language. Does it support index() like function? Can it convert between hex and decimal values? OTOH, would a solution in perl do?

UPDATE: I decided to give a perl solution anyway. Use index() in a loop (similar to CombatSquirrel's reply and possibly slower) ...

  sub has_alpha
  { my $string = shift;
    return
      scalar
        map { index($string , $_) == -1 ? () : 1 }
            ('a' .. 'z' , 'A' .. 'Z') ;
  }
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