什么是“=C2=A0"?在 MIME 编码的、引用可打印的文本中? [英] What is "=C2=A0" in MIME encoded, quoted-printable text?

问题描述

这是我试图解析的原始电子邮件示例:

This is an example raw email I am trying to parse:

MIME-version: 1.0
Content-type: text/html; charset=UTF-8
Content-transfer-encoding: quoted-printable
X-Mailer: Verizon Webmail
X-Originating-IP: [x.x.x.x]

=C2=A0test testing testing 123

=C2=A0 是什么?我已经尝试了六个带引号的可打印解析器，但没有一个能正确处理这个问题.如何在 C# 中正确解析它?

What is =C2=A0? I have tried a half dozen quoted-printable parsers, but none handle this correctly. How would one properly parse this in C#?

老实说，现在我正在编码:

Honestly, for now, I'm coding:

//TODO WTF
encoded = encoded.Replace("=C2=A0", "");

因为我无法弄清楚为什么该文本会随机出现在 MIME 内容中，并且不应该被呈现为任何内容.只需删除它，我就可以获得所需的效果 - 但为什么呢?！

Because I can't figure out why that text is there randomly within the MIME content, and isn't supposed to be rendered into anything. By just removing it, I'm getting the desired effect - but WHY?!

明确地说，我知道 (=[0-9A-F]{2}) 是一个编码字符.但在这种情况下，它似乎什么都不代表.

To be clear, I know that (=[0-9A-F]{2}) is an encoded character. But in this case, it seemingly represents NOTHING.

推荐答案

=C2=A0 代表字节 C2 A0.由于这是 UTF-8，所以它转换为 U+00A0，这是用于不间断空格的 Unicode.

=C2=A0 represents the bytes C2 A0. Since this is UTF-8, it translates to U+00A0, which is the Unicode for non-breaking space.

请参阅UTF-8(维基百科).

See UTF-8 (Wikipedia).

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