MedioTrabajo

    public static boolean isEmail(String correo) {
        Pattern pat = null;
        Matcher mat = null;

        pat = Pattern.compile("^([0-9a-zA-Z]([+_.-]*[0-9a-zA-Z])*@([a-zA-Z+-]+.){1,2}([a-zA-Z]+))$");
        mat = pat.matcher(correo);

        if (mat.find()) {
            System.out.println("[" + mat.group() + "]");
            return true;
        }
        else{
            return false;
        }
    }

public static boolean isChileanRUT(String digit) {
        Pattern pat = null;
        Matcher mat = null;

        pat = Pattern.compile("^([0-9]){1,2}.([0-9]){3}.([0-9]){3}-([0-9]){1}$");
        mat = pat.matcher(digit);

        if (mat.find()) {
            System.out.println("[" + mat.group() + "]");
            return true;
        }
        else{
            return false;
        }
    }

    // Quitar Formato RUT Chileno
    public static String RutNoFormat(String rut)
    {
        while(rut.indexOf(".") != -1)
        {
            rut = rut.replace(".", "");
        }
        while(rut.indexOf("-") != -1)
        {
            rut = rut.replace("-", "");
        }

        return rut;
    }

    // Setear Formato RUT Chileno
    public static String RutFormat(String rut)
    {
        int cont = 0;
        String format;
        rut = rut.replace(".", "");
        rut = rut.replace("-", "");
        format = "-"+rut.substring(rut.length()-1);
        for(int i = rut.length()-2;i>=0;i--){
            format = rut.substring(i, i+1)+format;
            cont++;
            if(cont == 3 && i != 0){
                format = "."+format;
                cont = 0;
            }
        }
        return format;
    }

    // Validar RUT Chileno
    public static boolean RutValidate(String rut){
        int dvR,dvT,suma=0;
        int[] serie = {2,3,4,5,6,7};
        rut = rut.replace(".", "");
        rut = rut.replace("-", "");

        if(rut.substring(rut.length() - 1).equals("K"))
        {
            dvR = 10;
        }
        else
        {
            dvR = Integer.valueOf(rut.substring(rut.length()-1));
        }

        for(int i = rut.length()-2;i>=0; i--){
            suma +=  Integer.valueOf(rut.substring(i, i+1))*serie[(rut.length()-2-i)%6];
        }

        dvT=11-suma%11;

        if(dvT == dvR){
            return true;
        }else{
            return false;
        }
    }