php - 跨度正则表达式替换

Question

我的数据库中有一个文本。例如:

Dummy Text Here...
<span class="youtube">nmkW544sK9U</span>

Dummy Text Here...
<span class="youtube">yUBKZvq5G2g</span>

...并且我需要将其替换为:

Dummy Text Here...
<iframe width="640" height="395" frameborder="0" allowfullscreen="" src="http://www.youtube.com/embed/nmkW544sK9U?rel=0"></iframe>

Dummy Text Here...
<iframe width="640" height="395" frameborder="0" allowfullscreen="" src="http://www.youtube.com/embed/yUBKZvq5G2g?rel=0"></iframe> 

但是我对正则表达式不够了解，请您帮助我。

Answer 1

遵循这些原则的东西应该起作用。

$replacement = '<iframe width="640" height="395" frameborder="0" allowfullscreen="" src="http://www.youtube.com/embed/$1?rel=0"></iframe>';
preg_replace('/<span class="youtube">(\w+)<\/span>/', $replacement, $string);