正则表达式验证

/**
 * 验证手机号是否合法
 * 
 * @return
 */
private boolean isMobileNO(String mobile){
    if (mobile.length() != 11)
    {
        return false;
    }else{
        /**
         * 移动号段正则表达式
         */
        String pat1 = "^((13[4-9])|(147)|(15[0-2,7-9])|(178)|(18[2-4,7-8]))\d{8}|(1705)\d{7}$";
        /**
         * 联通号段正则表达式
         */
        String pat2  = "^((13[0-2])|(145)|(15[5-6])|(176)|(18[5,6]))\d{8}|(1709)\d{7}$";
        /**
         * 电信号段正则表达式
         */
        String pat3  = "^((133)|(153)|(177)|(18[0,1,9])|(149))\d{8}$";
        /**
         * 虚拟运营商正则表达式
         */
        String pat4 = "^((170))\d{8}|(1718)|(1719)\d{7}$";

        Pattern pattern1 = Pattern.compile(pat1);
        Matcher match1 = pattern1.matcher(mobile);
        boolean isMatch1 = match1.matches();
        if(isMatch1){
            return true;
        }
        Pattern pattern2 = Pattern.compile(pat2);
        Matcher match2 = pattern2.matcher(mobile);
        boolean isMatch2 = match2.matches();
        if(isMatch2){
            return true;
        }
        Pattern pattern3 = Pattern.compile(pat3);
        Matcher match3 = pattern3.matcher(mobile);
        boolean isMatch3 = match3.matches();
        if(isMatch3){
            return true;
        }
        Pattern pattern4 = Pattern.compile(pat4);
        Matcher match4 = pattern4.matcher(mobile);
        boolean isMatch4 = match4.matches();
        if(isMatch4){
            return true;
        }
        return false;
    }
}