Extract hostname name from string Extract hostname name from string jquery jquery

Extract hostname name from string


javascript jquery regex

A neat trick without using regular expressions:

var tmp        = document.createElement ('a');;   tmp.href   = "http://www.example.com/12xy45";// tmp.hostname will now contain 'www.example.com'// tmp.host will now contain hostname and port 'www.example.com:80'

Wrap the above in a function such as the below and you have yourself a superb way of snatching the domain part out of an URI.

function url_domain(data) {  var    a      = document.createElement('a');         a.href = data;  return a.hostname;}

javascript jquery regex

I recommend using the npm package psl (Public Suffix List). The "Public Suffix List" is a list of all valid domain suffixes and rules, not just Country Code Top-Level domains, but unicode characters as well that would be considered the root domain (i.e. www.食狮.公司.cn, b.c.kobe.jp, etc.). Read more about it here.

Try:

npm install --save psl

Then with my "extractHostname" implementation run:

let psl = require('psl');let url = 'http://www.youtube.com/watch?v=ClkQA2Lb_iE';psl.get(extractHostname(url)); // returns youtube.com

I can't use an npm package, so below only tests extractHostname.

function extractHostname(url) {    var hostname;    //find & remove protocol (http, ftp, etc.) and get hostname    if (url.indexOf("//") > -1) {        hostname = url.split('/')[2];    }    else {        hostname = url.split('/')[0];    }    //find & remove port number    hostname = hostname.split(':')[0];    //find & remove "?"    hostname = hostname.split('?')[0];    return hostname;}//test the codeconsole.log("== Testing extractHostname: ==");console.log(extractHostname("http://www.blog.classroom.me.uk/index.php"));console.log(extractHostname("http://www.youtube.com/watch?v=ClkQA2Lb_iE"));console.log(extractHostname("https://www.youtube.com/watch?v=ClkQA2Lb_iE"));console.log(extractHostname("www.youtube.com/watch?v=ClkQA2Lb_iE"));console.log(extractHostname("ftps://ftp.websitename.com/dir/file.txt"));console.log(extractHostname("websitename.com:1234/dir/file.txt"));console.log(extractHostname("ftps://websitename.com:1234/dir/file.txt"));console.log(extractHostname("example.com?param=value"));console.log(extractHostname("https://facebook.github.io/jest/"));console.log(extractHostname("//youtube.com/watch?v=ClkQA2Lb_iE"));console.log(extractHostname("http://localhost:4200/watch?v=ClkQA2Lb_iE"));// Warning: you can use this function to extract the "root" domain, but it will not be as accurate as using the psl package.function extractRootDomain(url) {    var domain = extractHostname(url),        splitArr = domain.split('.'),        arrLen = splitArr.length;    //extracting the root domain here    //if there is a subdomain     if (arrLen > 2) {        domain = splitArr[arrLen - 2] + '.' + splitArr[arrLen - 1];        //check to see if it's using a Country Code Top Level Domain (ccTLD) (i.e. ".me.uk")        if (splitArr[arrLen - 2].length == 2 && splitArr[arrLen - 1].length == 2) {            //this is using a ccTLD            domain = splitArr[arrLen - 3] + '.' + domain;        }    }    return domain;}//test extractRootDomainconsole.log("== Testing extractRootDomain: ==");console.log(extractRootDomain("http://www.blog.classroom.me.uk/index.php"));console.log(extractRootDomain("http://www.youtube.com/watch?v=ClkQA2Lb_iE"));console.log(extractRootDomain("https://www.youtube.com/watch?v=ClkQA2Lb_iE"));console.log(extractRootDomain("www.youtube.com/watch?v=ClkQA2Lb_iE"));console.log(extractRootDomain("ftps://ftp.websitename.com/dir/file.txt"));console.log(extractRootDomain("websitename.co.uk:1234/dir/file.txt"));console.log(extractRootDomain("ftps://websitename.com:1234/dir/file.txt"));console.log(extractRootDomain("example.com?param=value"));console.log(extractRootDomain("https://facebook.github.io/jest/"));console.log(extractRootDomain("//youtube.com/watch?v=ClkQA2Lb_iE"));console.log(extractRootDomain("http://localhost:4200/watch?v=ClkQA2Lb_iE"));
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