JAVA 实现正则表达式代码

使用正则表达式验证邮箱，用户名，电话号码，固话号码，身份证，QQ号码等功能的Java实现 匹配返回类型为Boolean
下面是相关代码

 static boolean flag = false;
    public static boolean check(String str, String regex) {
        try {
            Pattern pattern = Pattern.compile(regex);
            Matcher matcher = pattern.matcher(str);
            flag = matcher.matches();
        } catch (Exception e) {
            flag = false;
        }
        return flag;
    }

    /**
     * 验证邮箱
     *
     * @param email
     * @return
     */
    public static boolean checkEmail(String email) {
        String regex = "\\w[-\\w.+]*@([A-Za-z0-9][-A-Za-z0-9]+\\.)+[A-Za-z]{2,14}";
        return check(email, regex);
    }
    /**
     * @param cellphone
     * @return
     */
    public static boolean checkCellphone(String cellphone) {
        String regex = "0?(13|14|15|18)[0-9]{9}";
        return check(cellphone, regex);
    }
    /**
     * 验证固话号码
     *
     * @param telephone
     * @return
     */
    public static boolean checkTelephone(String telephone) {
        String regex = "[0-9-()（）]{7,18}";
        return  check(telephone, regex);
    }


    /**
     * 验证QQ号码
     *
     * @param QQ
     * @return
     */
    public static boolean checkQQ(String QQ) {
        String regex = "[1-9]([0-9]{5,11})";
        return check(QQ, regex);
    }

    /**
     * 验证身份证号
     * @param IdCard
     * @return
     */
    public static boolean checkIdCard(String  IdCard){
        String regex="\\d{17}[\\d|x]|\\d{15}";
        return check(IdCard,regex);
    }

    /**
     * 验证用户名
     * @param userName
     * @return
     */
    public static boolean checkUserName(String userName){
        String regex="[A-Za-z0-9_\\-\\u4e00-\\u9fa5]+";
        return check(userName,regex);
    }