Matcher & Pattern Android

public String match(String cadena){
    String name = "";
    Pattern p = Pattern.compile("\\d");
    Matcher m = p.matcher(cadena);
    while (m.find()) {
        name = name + m.group(0);
    }
    return name;
}

please Help NEED ENTER STRING LIKE THIS ej. :USD $ 2300.00
RESULT : 2300.00