如何展开RFC 822 [英] How to do unfolding RFC 822

问题描述

我正在尝试编写vCard解析器，但在展开行时遇到了麻烦. 如您在此处看到的: http://www.faqs.org/rfcs/rfc822.html查找展开"，表示以下所有内容均有效:

I am trying to write a vCard Parser and am having trouble unfolding lines. As you can see here: http://www.faqs.org/rfcs/rfc822.html look for "unfolding" it says that all the following are valid:

Long string<return>
<tab>continue

Long string<return>
<tab>(n*<tab>)continue

Long string<return>
<space>continue

Long string<return>
<space>(n*<space>)continue

我该如何展开?为此有正则表达式吗?如果正在编写类，我将使用PHP:)

How do I unfold this? Is there a regex for this? I am using PHP if a class has been written I will use that :)

推荐答案

您可以使用它来删除这些折叠:

You could use this to remove those foldings:

$output = preg_replace('/\r\n(?:[ \t]+)/', '', $input);

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