问题

我有一个导入电子邮件到数据库的程序。为了在另一个程序中使电子邮件更易读，我必须去掉其中的HTML标记。我正在使用以下字符串扩展来去掉HTML标记。

```C#
public static string StripHtml(this string input)
{
   return Regex.Replace(input, "<.*?>", String.Empty);
}

问题是，当我复制转发的邮件时，发件人的电子邮件写在一个标记内。
<br>< example@forwared.com >

有没有办法使用正则表达式去除所有标记，除了包含@或电子邮件的标记？

这里提供了一个可能的解决方案：https://stackoverflow.com/questions/16708158/remove-html-tags-except-br-or-br-tags-with-javascript。但如果有办法只使用正则表达式来完成，我更喜欢那样做。

<details>
<summary>英文:</summary>

I have a program that imports emails to a database. To make the emails more readable in another program I have to strip it for html. I am using this string extension to strip the html. 

public static string StripHtml(this string input)
{
return Regex.Replace(input, "<.*?>", String.Empty);
}

The problem is that when I copy forwarded mails, the email of the sender is written inside a tag.
<br>< example@forwared.com >

Is there a way to use regex to remove all the tags, except tags that contains @ or an email?

The solution here is a possible way: https://stackoverflow.com/questions/16708158/remove-html-tags-except-br-or-br-tags-with-javascript. But If there is a way to do it with just regex I prefer to do that.

</details>


# 答案1
**得分**: 2

你可以通过向你原始的正则表达式添加额外条件来使用下面的 `Regex` 以满足你的要求：

    &lt;.[^@]*?&gt;

演示链接：https://regex101.com/r/CNOvS7/1/

<details>
<summary>英文:</summary>

You can use the below `Regex` by adding an extra condition to your original regex to achieve your requirement:

    &lt;.[^@]*?&gt;

Working Demo: https://regex101.com/r/CNOvS7/1/

</details>



# 答案2
**得分**: -1

使用 [^@]* 而不是 .* 
这是一个匹配除了 @ 之外的任何字符的字符集。^ 代表“非”。你也可以使用 [^0-9]* 来排除所有数字，例如。

<details>
<summary>英文:</summary>

Use [^@]* instead of .*
It’s a character set of anything but @. The ^ stands for “not”. You could also do something like that [^0-9]* to exclude all numbers for example.

</details>