javascript：如何使用正则表达式从网址中提取国家代码

Question

there is country code in url which i need to extract by regex and javascript.

so my possible url would be

http://example.com/gb/index.aspx

http://localhost:2020/gb/index.aspx

http://example:2020/gb/index.aspx

these code i tried but regex works for a specific type of url.

var url = "http://example.com/gb/index.aspx";
//Get the language code
var countrycode = /com\/([^\/]+)/.exec(url)[1];

the above code works when url look like http://example.com/gb/index.aspx but the moment url look like http://localhost:2020/gb/index.aspx or http://example:2020/gb/index.aspx then above code does not works. so tell me which regex i need to use which can extract country code from above 3 different kind of url. need some hint. thanks

Answer 1

^.{8}[^\\/]*\\/([^\\/]*)

• ^ : anchor at start
• .{8} :skip over first 8 chars (http(s)://)
• [^\\/] : match over any chars except '/'
• \\/ match the first slash after that
• ([^\\/]*) : create a new group and match any char except '/' (this is the country code)

 var urls = [ "http://example.com/gb/index.aspx", "http://localhost:2020/gb/index.aspx", "http://example:2020/gb/index.aspx" ]; var rxGetCountryCode = /^.{8}[^\\/]*\\/([^\\/]*)/; urls.forEach(function (str) { console.log(rxGetCountryCode.exec(str)[1]); });