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Re: Extracting multiple matches from a string using preg_replace [message #178590 is a reply to message #178584]

Tue, 10 July 2012 09:08

jwcarlton
Messages: 76
Registered: December 2010

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On Monday, July 9, 2012 9:29:15 AM UTC-4, Peter H. Coffin wrote:
> That's the drawback to using preg_replace() for this. You can't capture
> all the bits you want to extract because you *must* enumerate them.
> preg_match_all() returns an array of matches, which is what you want if
> you don't know how many you're going to get back going in.

Just a note for anyone else reading this later, preg_match_all() did work perfectly. I changed:

$this_id = preg_match(...);

to this:

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

This gives me a multidimensional array of $matches, where $matches[2] is the array that holds the values from $2.

So after finding the array, it's a simple matter of putting the second preg_replace() in a foreach loop:

foreach ($matches[2] as $this_id) {
// I'm still not sure why $this_id is keeping the other params
list($this_id) = explode("&", $this_id);

$this_comment = preg_replace(...);
}

Thanks for the help, Peter! If you happen to see the error I'm making with the extra params (forcing me to use explode to get rid of them), I'd appreciate any insight. The workaround is working, though, so it's not a big deal... just sloppy, I guess.

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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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