php youtube and links regex are combining and in turn rendering useless

Question

i have a posting feature on my site that can embed links and youtube videos. the problem is, that the two clash together, and the youtube iframe ends up being a 404 page on my site. my codes for the youtube videos and links are below, but im not sure how to stop them from combining and ruining it.
by combining, i mean this http://www.youtube.com/watch?v=VhqiT2nWCVU turns to
<iframe src="http://www.youtube.com/watch?v=VhqiT2nWCVU">
which then turns into

<iframe src="<a href="http://www.youtube.com/watch?v=VhqiT2nWCVU"></a>">

sorry if i am unclear in any way. my codes are below.

function youtube($string)
{
  return preg_replace(
    '#(http://(www.)?youtube.com)?/(v/|watch\?v\=)([-|~_0-9A-Za-z]+)&?.*?#i',
    '<iframe title="YouTube video player" width="480" height="390" src="http://www.youtube.com/embed/$4?rel=0" frameborder="0" allowfullscreen></iframe>',
    $string
  );
}

$posted = youtube($posted);

$rexProtocol = '(https?://)?';
$rexDomain   = '((?:[-a-zA-Z0-9]{1,63}\.)+[-a-zA-Z0-9]{2,63}|(?:[0-9]{1,3}\.){3}[0-9]{1,3})';
$rexPort     = '(:[0-9]{1,5})?';
$rexPath     = '(/[!$-/0-9:;=@_\':;!a-zA-Z\x7f-\xff]*?)?';
$rexQuery    = '(\?[!$-/0-9:;=@_\':;!a-zA-Z\x7f-\xff]+?)?';
$rexFragment = '(#[!$-/0-9:;=@_\':;!a-zA-Z\x7f-\xff]+?)?';

// Solution 1:

function callback($match)
{
    // Prepend http:// if no protocol specified
    $completeUrl = $match[1] ? $match[0] : "http://{$match[0]}";

    return '<a href="' . $completeUrl . '">'
        . $match[2] . $match[3] . $match[4] . '</a>';
}


$posted = preg_replace_callback("&\\b$rexProtocol$rexDomain$rexPort$rexPath$rexQuery$rexFragment(?=[?.!,;:\"]?(\s|$))&",
    'callback', $posted);

See my answer to a nearly duplicate question: How to find all Youtube video ids in a string using a regex? Note that the regex in that answer skips over already-linked You-Tube URLs and will likely work quite well for your purposes. — ridgerunner
– ridgerunner, Commented Aug 26, 2013 at 0:25

Dragony · Accepted Answer · 2013-08-25 21:17:33Z

1

A popular solution to this problem is to use placeholders. On your first pass you turn all YouTube links into a placeholder, for example:

{{youtube:VhqiT2nWCVU}}

After that you run your normal link converter. And at the end your run yet another regex to turn all your palceholders into youtube embeds.

answered Aug 25, 2013 at 21:17

Dragony

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3 Comments

user2166538 Over a year ago

could you possibly explain this using an example?

Dragony Over a year ago

rextester.com/OMOCIS38257 To see what it does press "Run it" at the bottom

user2166538 Over a year ago

Thanks @dragony I will accept your answer tommorow if it works

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