正则表达式以获取javascript中的域名？

Question

我有一个问题，正则表达式从一个网址获得主域名。也就是说，如果我有如下所示的urls。

http://domain.com/return/java.php?hello.asp
http://www.domain.com/return/java.php?hello.asp
http://blog.domain.net/return/java.php?hello.asp
http://us.blog.domain.co.us/return/java.php?hello.asp
http://domain.co.uk
http://domain.net
http://www.blog.domain.co.ca/return/java.php?hello.asp
http://us.domain.com/return/

由此，我应该只将域作为正则表达式的输出。那我该怎么做呢？我用过；

var url = urls.match(/[^.]*.(com|net|org|info|coop|int|co\.uk|org\.uk|ac\.uk|uk)/g);

但它并不适用于

  http://domain.net

有人能帮我解决这个问题吗。

Answer 1

您可以使用URL而不是regex。

var url  = new URL("http://domain.com/return/java.php?hello.asp");
console.log(url.hostname);
=> domain.com

或

如果你也想要协议

var url  = new URL("http://domain.com/return/java.php?hello.asp");
console.log(url.protocol+"//"+url.hostname);
= > http://domain.com

Answer 2

这个有用吗？

(http|https|ftp):\/\/([a-zA-Z0-9.])+/g

火柴

http://domain.com
http://www.domain.com
http://blog.domain.net
http://us.blog.domain.co.us
http://domain.co.uk
http://domain.net
http://www.blog.domain.co.ca
http://us.domain.com

Answer 3

下面是一个稍微改变正则表达式的解决方案：

url.match(/https?:\/\/[^/]+((?=\/)|$)/g);
//tested with Chrome 38+ on Win7

基本检查斜杠/或string end $

更新用内联堆栈溢出替换了jsFiddle链接-代码：

​

var urls = ['http://domain.com/return/java.php?hello.asp',
  'http://www.domain.com/return/java.php?hello.asp',
  'http://blog.domain.net/return/java.php?hello.asp',
  'http://us.blog.domain.co.us/return/java.php?hello.asp',
  'http://domain.co.uk',
  'http://domain.net',
  'http://www.blog.domain.co.ca/return/java.php?hello.asp',
  'http://us.domain.com/return/'
];

var htmlConsole = document.getElementById("result");
var htmlTab = "    ";
var htmlNewLine = "<br />";

htmlConsole.innerHTML = "";
for (var id in urls) {

  htmlConsole.innerHTML += "URL: " + urls[id] + htmlNewLine;

  var matchResults = urls[id].match(/https?:\/\/[^/]+((?=\/)|$)/g);

  for (var innerIdx in matchResults) {
    htmlConsole.innerHTML += htmlTab + "MatchNumber: " + innerIdx + " MatchValue: " + matchResults[innerIdx] + htmlNewLine;
  }

  htmlConsole.innerHTML += htmlNewLine;

}

<div id="result">
</div>

​