Javascript regex格式价格，2种情况

Question

我有2种价格格式的案例，我被卡在正则表达式上，找不到任何解决方案。

我用来格式化价格的正则表达式：/(\d)(\d{3})(\.)/g

情况1：

var price             = '1000000.0000';
var decimals          = 2;
var thousandSeparator = ',';
var decimalSeparator  = '.';
var formatedPrice     = price.replace(/(\d)(\d{3})(\.)/g, '$1' + thousandSeparator + '$2' + decimalSeparator + '');
document.querySelector( '#case_1 span' ).innerHTML = formatedPrice;

结果：1000,000.0000

预期：1,000,000.0000

情况2：

var price             = '1000000.0000';
var decimals          = 2;
var thousandSeparator = '.';
var decimalSeparator  = ',';
var formatedPrice     = price.replace(/(\d)(\d{3})(\.)/g, '$1' + thousandSeparator + '$2' + decimalSeparator + '');
document.querySelector( '#case_2 span' ).innerHTML = formatedPrice;

结果：1000.000,0000

预期：1.000.000,0000

JsFiddle：https://jsfiddle.net/cpan2s6d/

是否可以仅使用正则表达式来实现？

谢谢

Answer 1

尝试一下：

首先用小数点分隔符替换所有点。然后将数千人分组。

import sys
import os

#List of weekdays
weekdays = ['Monday' ,'Tuesday' ,'Wednesday', 'Thursday' , 'Friday' ,'Saturday', 'Sunday']

print('Enter Your DOB as DD/MM/YYYY: ')

day = input("Day: ")
month = input("Month: ")

X = ''

#Check for month
if month in  ['02' , '04', '06', '09', '11']:
    i = 30
    X = 'Answer'

Y = input("Year: ")
if (len(Y)) < 4:
    print('You Have Entered A Too Short Or Too Long of a Year')
    sys.exit(0)

if X == 'Answer':
    print('This Is True')

elif X != 'Answer':
    print('This is False')

print("You Were Born On A:")

input("Press ENTER To Exit")

代码：

price.replace(".", decimalSeparator).replace(/\B(?=(\d{3})+(?!\d))/g, thousandSeparator);

var price = '1000000.00';
var decimals = 2;
var thousandSeparator = ',';
var decimalSeparator = '.';
var formatedPrice = price.replace(".", decimalSeparator).replace(/\B(?=(\d{3})+(?!\d))/g, thousandSeparator);

document.querySelector('#case_1 span').innerHTML = formatedPrice;

var price = '1000000.00';
var decimals = 2;
var thousandSeparator = '.';
var decimalSeparator = ',';
var formatedPrice = price.replace(".", decimalSeparator).replace(/\B(?=(\d{3})+(?!\d))/g, thousandSeparator);

document.querySelector('#case_2 span').innerHTML = formatedPrice