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Question

可能重复：
parse youtube video id using preg_match

$message = "this is an youtube video http://www.youtube.com/watch?v=w6yF_UV1n1o&feature=fvst i want only the id"; 

$message = preg_replace('%(?:youtube(?:-nocookie)?\.com/(?:[^/]+/.+/|(?:v|e(?:mbed)?)/|.*[?&]v=)|youtu\.be/)([^"&?/ ]{11})%i', '\\1', $message); 

print $message; 

上面印...

this is an youtube video http://www.w6yF_UV1n1o&feature=fvst i want only the id 

什么我想要的是：

this is an youtube video w6yF_UV1n1o i want only the id 

在此先感谢:)

Answer 1

首先，你将匹配一个有效的URL，然后从URL中提取有效的YouTube ID，然后更换相匹配的ID找到原始URL（如果一个有效的ID是发现）：

<?php 

$message = " 
    this is a youtube video http://www.youtube.com/watch?v=w6yF_UV1n1o&feature=fvst i want only the id 
    this is not a youtube video http://google.com do nothing 
    this is an youtube video http://www.youtube.com/watch?v=w6yF_UV1n1o&feature=fvst i want only the id 
"; 

preg_match_all('#\b(([\w-]+://?|www[.])[^\s()<>]+(?:\([\w\d]+\)|([^[:punct:]\s]|/)))#', $message, $matches); 

if (isset($matches[0])) 
{ 
    foreach ($matches[0] AS $url) 
    { 
     if (preg_match('%(?:youtube(?:-nocookie)?\.com/(?:[^/]+/.+/|(?:v|e(?:mbed)?)/|.*[?&]v=)|youtu\.be/)([^"&?/ ]{11})%i', $url, $matches)) 
      $message = str_replace($url, $matches[1], $message); 
    } 
} 

echo $message; 

来源：http://daringfireball.net/2009/11/liberal_regex_for_matching_urls & https://stackoverflow.com/a/6382259/1748964