正则表达式

先了解正则表达式各个符号的作用

该方法仅用于将科学计数法的长数字串转换为电话号码

private static void test(){
        //测试正则表达式
        String zhengze = "[1-9]{1}(.){1}[0-9]*(E){1}\\d+";
        String zhengze2 = "[1-9]{1}(.){1}[0-9]{10}(E){1}(10){1}";
        String cell = "5.6545654546E10attr_json";

        int aIndex = cell.indexOf("a");
        String num = cell.substring(0,aIndex);
        String afterStr = cell.substring(aIndex);
        BigDecimal bd = new BigDecimal(num);
        if(num.matches(zhengze2)){
            System.out.println("转换输出："+bd.toPlainString() + afterStr);
        }
    }