Regex PHP - 自动检测 YouTube、图像和“常规"链接

问题描述

我希望在我的聊天应用程序中，可以点击指向网站的链接，并自动嵌入指向 YouTube 和图像的链接.

I want to make it so that in my chat-application, links to websites can be clickable and links to YouTube and images automatically gets embedded.

我已经为我的 WebIRC 客户端使用 Java 编写了这段代码，但现在我正在尝试使用 PHP 和 JavaScript 编写它.

I've made this code in Java for my WebIRC client but now I'm trying to make it in PHP and JavaScript.

我还不熟悉 PHP，所以我不太了解在那里使用正则表达式.我想知道是否有好心人能帮我解决这个问题...

I'm not familiar with PHP yet so I don't know that much about using regex there. I wonder if some kind soul could help me with this...

对于 YouTube 的东西，我尝试过但没有成功:

For the YouTube-thingy I tried this without success:

if (preg_match("#(?<=v=)[a-zA-Z0-9-]+(?=&)|(?<=v/)[^&
]+|(?<=v=)[^&
]+|(?<=youtu.be/)[^&
]+#", $message, $m)) {
    $video_id = $m[1];
    $message = preg_replace("#(?<=v=)[a-zA-Z0-9-]+(?=&)|(?<=v/)[^&
]+|(?<=v=)[^&
]+|(?<=youtu.be/)[^&
]+#","<iframe class='embedded-video' src='http://www.youtube.com/embed/" . $video_id . "' allowfullscreen></iframe>",$message);
}

推荐答案

这是我想出的解决方案:

Here is a solution I came up with:

$str = 'This is an image: google.ca/images/srpr/logo3w.png

YouTube: http://www.youtube.com/watch?v=V2b8ilapFrI&feature=related

Stackoverflow:  http://stackoverflow.com/';

$str = preg_replace_callback('#(?:https?://S+)|(?:www.S+)|(?:S+.S+)#', function($arr)
{
    if(strpos($arr[0], 'http://') !== 0)
    {
        $arr[0] = 'http://' . $arr[0];
    }
    $url = parse_url($arr[0]);

    // images
    if(preg_match('#.(png|jpg|gif)$#', $url['path']))
    {
        return '<img src="'. $arr[0] . '" />';
    }
    // youtube
    if(in_array($url['host'], array('www.youtube.com', 'youtube.com'))
      && $url['path'] == '/watch'
      && isset($url['query']))
    {
        parse_str($url['query'], $query);
        return sprintf('<iframe class="embedded-video" src="http://www.youtube.com/embed/%s" allowfullscreen></iframe>', $query['v']);
    }
    //links
    return sprintf('<a href="%1$s">%1$s</a>', $arr[0]);
}, $str);

如果您需要我为您澄清任何事情，请告诉我.

Let me know if you need me to clarify anything for you.

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