Question

I am trying to do something like this but I doesnt seem to work

String test = input.matches("[^a-zA-Z\\s]");

I get an error saying incompatible types

Is there any way fixing this or any other methods?

EDIT

This is what I’m trying to achieve

Lets say i have this string

String full = " This i$ an aaasdAr yeEeeAs oofo qwdsgy XY9 ";

and i need to have the output as $9

this works but its a bit too messy

 for (int index = 0; index <= input.length() - 1; index ++)
            {
                if(String.valueOf(input.charAt(index)).matches("[^a-zA-Z\\s]"))
            {

            System.out.print(String.valueOf(input.charAt(index)));
            }
        }

Answer 1

To solve your specific problem, you can use String.replaceAll, which takes a replacement regex:

String input = " This i$ an aaasdAr yeEeeAs oofo qwdsgy XY9 ";
String output = input.replaceAll("[a-zA-Z\\s]", "");
System.out.println(output);

This replaces everything that matches the regex with the empty string, and it prints $9.