如何刪除一切，但URL PHP

Question

可能重複：
Regex to match URL

我知道正則表達式應該能夠做到這一點，但我無法弄清楚如何做到這一點。我無法搜索一串文本並只返回網址。你將如何在PHP中做到這一點？

例

hello there everyone visit this link: http://google.com and this one as well http://amazon.com 

將返回：

http://google.com

http://amazon.com

任何想法？

Answer 1

這應該工作：

$text = "hello there everyone visit this link: http://google.com and this one as well http://amazon.com"; 
preg_match_all('/\b(([\w-]+:\/\/?|www[.])[^\s()<>]+(?:\([\w\d]+\)|([^[:punct:]\s]|\/)))/',$text,$matches); 
print_r($matches[0]);