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Extracting multiple matches from a string using preg_replace [message #178582]

Mon, 09 July 2012 08:50

jwcarlton
Messages: 76
Registered: December 2010

Karma:

Member

I'm working with a message board database that already has a bunch of YouTube links in the comments, and I'm trying to replace all of the links with a new alternate.

The existing strings are like:

$this_comment = '<a href="

" target="_new">http://www.youtube.com/watc...vidid</a><br><br><a href="

" target="_new">http://www.youtube.com/watc...vidid_2</a>';

Notice that this string has 2 separate YouTube links.

If you're not familiar, YouTube has several possible link formats, so using parse_url() doesn't really work:

youtube.com/v/{vidid}
youtube.com/vi/{vidid}
youtube.com/?v={vidid}
youtube.com/?vi={vidid}
youtube.com/watch?v={vidid}
youtube.com/watch?vi={vidid}
youtu.be/{vidid}
youtube.com/v/{vidid}?feature=autoshare&version=3&autohide=1&au toplay=1

I've written the regex to find the ID and replace the link correctly, but it only works with the first link that it finds. How do I make it work with all of the matching links in the string?

Here's what I have:

// Fetch the VIDID
$this_id = preg_replace("#.*?<a href=\" http://.*?youtu\.*?be[\.com]*/[watch]*[\?]*(v/|v=|vi/|vi=)*(.*?)[&.+]*\ " target=\"_new\">.*?<\/a>.*#",
"$2", $this_comment);

// I'm not sure why preg_replace isn't catching the extra variables;
// I thought the [&.+]* would do this? Either way, this is a workaround:
list($this_id) = explode("&", $this_id);

// Replace link
if ($this_id) {
$new_link = "Example replacement: $this_id";

$this_comment = preg_replace("#<a href=\"http://.*?youtu\.*?be[\.com]*/[watch]*[\?]*(v/|v=|vi/|vi=)*" . $this_id . "[&.+]*\" target=\"_new\">.*?<\/a>#",
"$new_link", $this_comment);
}

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[Message index]

		Extracting multiple matches from a string using preg_replace By: jwcarlton on Mon, 09 July 2012 08:50
		Re: Extracting multiple matches from a string using preg_replace By: Captain Paralytic on Mon, 09 July 2012 12:44
		Re: Extracting multiple matches from a string using preg_replace By: jwcarlton on Mon, 09 July 2012 18:58
		Re: Extracting multiple matches from a string using preg_replace By: Peter H. Coffin on Mon, 09 July 2012 13:29
		Re: Extracting multiple matches from a string using preg_replace By: jwcarlton on Mon, 09 July 2012 19:00
		Re: Extracting multiple matches from a string using preg_replace By: jwcarlton on Tue, 10 July 2012 09:08

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