Only digits and dots and nothing else

Here is the requirement where the input is a String and our program should find whether it contains characters like a ,b (or) any special characters.

It can accept only digits and dots and nothing else and return a boolean result.

public static boolean questionnarieSpecific(String input){

Pattern p = Pattern.compile("[^\\d\\.]");
Matcher m = p.matcher(input);
boolean b = false;
boolean result = true;

while(b = m.find()) {
result= false;
break;
}

return result;
}