Expressão regular [RESOLVIDO]

import java.util.regex.Pattern;
import java.util.regex.Matcher;

class TesteLol2 {
    public static void main(String[] args) {
        Pattern pat = Pattern.compile("@(.+?)@");  
        Matcher mat = pat.matcher("@valor1@ + @valor2@ + @valor3@ ");  
        while (mat.find ()) {
            System.out.println (mat.group (1));
        }
    }
}