Removing the www. from a URL using JavaScript

Question

Removing the www. from a URL using JavaScript

I am attempting to remove only the prefix www. from a URL using JavaScript. Initially, I attempted to utilize the regular expression /^(?:www\.)?/i:

"www.example.com".replace(/^(?:www\.)?/i, "")

This method worked successfully for URLs without a protocol (e.g., www.example.com). However, it failed when trying to remove the prefix from URLs with protocols attached, such as https://www.example.com.

My goal is to achieve the following transformations:

https://www.example.com/   ->   https://example.com/

WWW.example.com/   ->   example.com/

javascript regex string url replace

Answer 1

Answer №1

Here is a solution for you :

const url = 'https://www.example.com';

const result = url.match(/^(http(s)?:(\/\/)www\.|www\.)(.*)/);

console.log(result[result.length - 1]);

Regular Expression (RegEx) breakdown :

^ -> start of the string
(http(s)?:(\/\/)www\. -> matches strings starting with either https://www. or http://www.
| -> means OR
www\. -> matches strings starting with www.
```
(.*) ==> capturing group, <code>.
```
matches any character, * zero or more times

Answer 2

Here is a solution for you :

const url = 'https://www.example.com';

const result = url.match(/^(http(s)?:(\/\/)www\.|www\.)(.*)/);

console.log(result[result.length - 1]);

Regular Expression (RegEx) breakdown :

^ -> start of the string
(http(s)?:(\/\/)www\. -> matches strings starting with either https://www. or http://www.
| -> means OR
www\. -> matches strings starting with www.
```
(.*) ==> capturing group, <code>.
```
matches any character, * zero or more times

Answer 3

Answer №2

To remove all occurrences of www, regardless of placement

/www/.replace('')

If you only want to delete 'www' when it follows //

/(\/\/)www/.replace('$1')

Simply replace www if it precedes a DOT

/www(\.)/.replace('$1')

The safest option: To avoid accidentally removing www from the querystring or hash

Includes

www.
http://www.
//www.

/^([^:\.]*)(\:\/\/)?www(\.)/.replace('$1$2$3')

Answer 4

To remove all occurrences of www, regardless of placement

/www/.replace('')

If you only want to delete 'www' when it follows //

/(\/\/)www/.replace('$1')

Simply replace www if it precedes a DOT

/www(\.)/.replace('$1')

The safest option: To avoid accidentally removing www from the querystring or hash

Includes

www.
http://www.
//www.

/^([^:\.]*)(\:\/\/)?www(\.)/.replace('$1$2$3')

Answer 5

Answer №3

Check out this handy function that can help with that:

function removeSubdomain(url) {
  // Define the regular expression with 3 capturing groups
  const regExp = /^(https?:\/\/)?(www\.)?(.*)/;
  const regExpArr = regExp.exec(url);
  // If there's no match, return the original URL
  if (!regExpArr) return url;
  // Create a new URL without the "www." subdomain using captured groups
  // Group 1 will be empty if the protocol is missing
  return `${regExpArr[1] ?? ""}${regExpArr[3]}`
}

const urls = [
  "http://www.example.com", 
  "https://www.example.com", 
  "www.example.com", 
  "example.com",
  "http://example.com"
];

console.log(urls.map(removeSubdomain))

Answer 6

Check out this handy function that can help with that:

function removeSubdomain(url) {
  // Define the regular expression with 3 capturing groups
  const regExp = /^(https?:\/\/)?(www\.)?(.*)/;
  const regExpArr = regExp.exec(url);
  // If there's no match, return the original URL
  if (!regExpArr) return url;
  // Create a new URL without the "www." subdomain using captured groups
  // Group 1 will be empty if the protocol is missing
  return `${regExpArr[1] ?? ""}${regExpArr[3]}`
}

const urls = [
  "http://www.example.com", 
  "https://www.example.com", 
  "www.example.com", 
  "example.com",
  "http://example.com"
];

console.log(urls.map(removeSubdomain))

Answer 7

Answer №4

Simply swap out the keyword and insert empty spaces instead.

For instance:

const websiteUrl = "https://www.samplesite.com";
const finalUrl = websiteUrl.replace("samplesite","");
console.log("Initial Url",websiteUrl);
console.log("Modified Url",finalUrl);

Answer 8

Simply swap out the keyword and insert empty spaces instead.

For instance:

const websiteUrl = "https://www.samplesite.com";
const finalUrl = websiteUrl.replace("samplesite","");
console.log("Initial Url",websiteUrl);
console.log("Modified Url",finalUrl);

Removing the www. from a URL using JavaScript

Answer №1

Answer №2

Answer №3

Answer №4

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