Javascript：如何在 // 之后和之前获取字符串的 Substring

Question

I have a string like https://www.google.com

I would like to get www so the substring of a string after // and before . (dot).

How can I do it? I have tried using the split and substring method. But it did not work.

Any help would be great.

Thank You.

Answer 1

Using replace()

Regex Demo

 let result = 'https://www.google.com'.replace(/https?:\/\/([^.]+).*/, '$1') console.log(result)

Answer 2

Have a look at the URL browser API if available https://developer.mozilla.org/en-US/docs/Web/API/URL

Another solution would be

var parser = document.createElement('a');
parser.href = "http://example.com:3000/pathname/?search=test#hash";

parser.protocol; // => "http:"
parser.hostname; // => "example.com"
parser.port;     // => "3000"
parser.pathname; // => "/pathname/"
parser.search;   // => "?search=test"
parser.hash;     // => "#hash"
parser.host;     // => "example.com:3000"