how to replace domain name by javascript

Question

Is there a way to get the domain without the hostname from the URL?

I have the following list

const value1 = 'https://localhost:4200/~';
const value2 = 'https://hoge.com/~';
const value3 = 'https://www.hoge.com/~';
const value4 = 'https://wwwtest.hoge.com/~';
const value5 = 'https://www-test.hoge.com/~';

the answer i'm looking for

'localhost:4200/~'; //value1 
'hoge.com/~'; //value2
'hoge.com/~'; //value3
'hoge.com/~'; //value4
'hoge.com/~'; //value5

I tried the following method, but the answer was not correct.

function hogeReplace(value: string): string {
  return value.replace(/^https?:\/\/|www.*\./g, '');
}

console.log(hogeReplace(value1)); // localhost:4200/~
console.log(hogeReplace(value2)); // hoge.com/~
console.log(hogeReplace(value3)); // com/~
console.log(hogeReplace(value4)); // com/~
console.log(hogeReplace(value5)); // com/~

someone answer?

Just use the substring method to remove the first 8 characters — Ayudh
– Ayudh, Commented Feb 28, 2023 at 1:33
You may want to start with parsing the url and then split it up instead of using a regex — Crowcoder
– Crowcoder, Commented Feb 28, 2023 at 1:38
It sounds like you've not looked at the vast amount of information window.location and URL can give you. All those URLs have the same top level domain. — Mike 'Pomax' Kamermans
– Mike 'Pomax' Kamermans, Commented Feb 28, 2023 at 1:38
"domain without the hostname"... 🤔 aren't they essentially the same thing? TLDs are entirely subjective and would be difficult to parse out. How do you tell the difference between a .com, .co.uk, .museum, or .i.paid.good.money.for.this? — Phil
– Phil, Commented Feb 28, 2023 at 1:40

ProfDFrancis · Accepted Answer · 2023-02-28 02:11:35Z

2

Step by step solution:

I am assuming by "domain name" you mean specifically hoge.com, or any two element domain name?

In which case my recommendation would be:

Chop off the https.
Break up the remaining items by "/". Everything after the first "/" can stay.
What is before that first "/", slice into pieces by ".". Keep only the last two of those.

function hogeReplace(value) {
  const withoutHttp = value.replace(/^https?:\/\//, '');
  const segments = withoutHttp.split("/");
  const hostname = segments[0]
  const localPath = segments.slice(1).join("/")
  const domainName = hostname.replace(/^www[a-zA-Z~-]*/,"")
  return domainName + "/" + localPath
}

console.log(hogeReplace("https://localhost:4200/~"))
console.log(hogeReplace("https://hoge.com/~"))
console.log(hogeReplace("https://www.hoge.com/~"))
console.log(hogeReplace("https://wwwtest.hoge.com/~"))
console.log(hogeReplace("https://www-test.hoge.com/~"))
console.log(hogeReplace("https://www.hoge.co.uk/~"))

edited Feb 28, 2023 at 2:11

answered Feb 28, 2023 at 1:44

ProfDFrancis

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9 Comments

Phil Over a year ago

What about hoge.co.uk?

ProfDFrancis Over a year ago

Yes it won't work for that. However it looks like he is only interested in hoge.com.

Phil Over a year ago

Rather than use a regex, I'd be more inclined to parse the string as a URL and extract the hostname. That way you won't get false positives for things like credentials

Phil Over a year ago

@shibata if that is actually a requirement, then your question is far too broad right now. It needs a lot more detail

shibata Over a year ago

thank you Eureka!!!!! I love you !!!!!!!!

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