如何使用正则表达式编辑字符串 [英] How Do I Use Regex To Edit String

问题描述

我需要使用正则表达式编辑一个字符串，看起来像4,000,000，我一直在环顾四周，但是找不到它，请帮助我知道我必须声明

i need to edit a string to look like 4,000,000 using regex and i have been looking around it, but can find no way on it please help i know that i have to declare

using System.Text.RegularExpressions

但是从那我不知道，我有一直在玩正则表达式，但我希望当我将值插入文本框时，它已经添加，所需的地方

but from that i have no idea , i have been playing with regex, but i want to as i insert the values into the textbox that it already adds the "," where needed

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