问题
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
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 :)
回答1:
You could use this to remove those foldings:
$output = preg_replace('/\r\n(?:[ \t]+)/', '', $input);
来源:https://stackoverflow.com/questions/4227783/how-to-do-unfolding-rfc-822