Posted by Zenofobe on 09/07/07 06:02

Howdy folks,

On this page at php.net
http://www.php.net/features.http-auth
there's a regular expression in Example 34.2. It's supposed to parse out
the different values being passed in the header. I know what it's
supposed to do, so I have a vague idea of what's being done in the RE,
but I've been having a heck of a time figuring out what each part of the
RE is actually doing. Here's what I have so far:

preg_match_all('@(\w+)=(?:([\'"])([^\2]+)\2|([^\s,]+))@', $txt, $matches,
PREG_SET_ORDER);

//'@
//(\w+) Any word character (letter/digit/_), 1 or more
//= Equal sign
//(?: This submatch will not be captured (still available for
later matching)
//([\'"]) A single or double quote
//([^\2]+) Not start of text (STX)?, 1 or more
//\2|
//([^\s,]+) Not whitespace or comma, 1 or more
//)
//@'

I'm unclear as to what the second \2 does, as well as which parts the OR
applies to. And what are the @s for?

Thanks for any help,
ZF

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