public static void main(String[] args){
   System.out.println(AssistController.isNumeric("-77"));
}

public static boolean isNumeric(String str){
    Pattern pattern = Pattern.compile("-?[0-9]+(\\\\.[0-9]+)?");
    Matcher isNum = pattern.matcher(str);
    if( !isNum.matches() ){
        return false;
    }
    return true;
}

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