package expressaoregular;

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

public class MascaraValidacaoCPF {

    public static boolean ehCPFValido(String cpf) {
        if (cpf == null || cpf.trim().isEmpty()
                || cpf.trim().length() != 14) {
            return false;
        }

        if (cpfContemApenasNumeros(cpf)) {
            return true;
        }

        return false;
    }

    private static boolean cpfContemApenasNumeros(String cpf) {
        Pattern patternNumero = Pattern.compile("\\d{3}.\\d{3}.\\d{3}-\\d{2}");
        Matcher matcherCPF = patternNumero.matcher(cpf);

        if (matcherCPF.find()) {
            return true;
        }

        return false;
    }

}