javascript regex seems to be ignoring anchor

I am trying to make a javascript bookmarklet that takes the current page url, modifies the domain to a different one, then opens that in a new tab.

for example, given the url:

https://prod.abc.com/lorum/a-1234/b/c.d/e/1234#fg:hij

I want to run the bookmarklet and have it open

https://dev.abc-1-de.net/lorum/a-1234/b/c.d/e/1234#fg:hij

This is my current code

javascript:(function() {window.open(window.location.toString().replace(/^https:\/\/.*?abc.com\//, 'https://dev.abc-1-de.net/'), '_blank');})() 

When I run

window.location.toString().replace(/^https:\/\/.*?abc.com\//, 'https://dev.abc-1-de.net/')

I get the url I'm expecting. However, when I run the whole thing together, the new tab that opens is directed to

https://prod.abc.com/lorum/a-1234/b/c.d/e/https://dev.abc-1-de.net/lorum/a-1234/b/c.d/e/1234#fg:hij.

To me, this seems like the regex is ignoring my ^ anchor for some reason, but I have no idea why that would be happening only when it is passed into window.open.

Running this seems to work, as you said:

var oldUrl = "https://prod.abc.com/lorum/a-1234/b/c.d/e/1234#fg:hij";
var newUrl = oldUrl.replace(/^https:\/\/.*?abc.com\//, 'https://dev.abc-1-de.net/');

console.log(newUrl)

The console prints out https://dev.abc-1-de.net/lorum/a-1234/b/c.d/e/1234#fg:hij as you expect it to.

When I run this code:

window.open("https://dev.abc-1-de.net/lorum/a-1234/b/c.d/e/1234#fg:hij", "_blank")

I am just redirected to a blank window in a new tab. However setting window.location.href does redirect, but it does not open in a new window

window.location.href = "https://dev.abc-1-de.net/lorum/a-1234/b/c.d/e/1234#fg:hij";

So your full code would be

javascript:(function() {
  window.location.href = window.location.toString().replace(/^https:\/\/.*?abc.com\//, 'https://dev.abc-1-de.net/');
}() 

Seems to be working correctly for me.I made a new bookmark with the code javascript:(function() {window.open(window.location.toString().replace(/^https:\/\/.*?.com\//, 'https://dev.abc-1-de.net/'), '_blank');})()

I removed the abc from the regex and now this bookmark will work for all domains. It essentially replaces the the domain with dev.abc-1-de.net

Turns out, the issue was a typo in the replacement url I was giving, as well as in the way that window.open works. The replacement url I was giving in my unobfuscated code had the typo https//: instead of https:.

This made the window.open function think this was a relative url instead of an absolute, and so it was appending it instead of properly redirecting.

One does not even need a regex because one could utilize URL on that matter. Example ...

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-js -->

const url =
  new URL("https://prod.abc.com/lorum/a-1234/b/c.d/e/1234#fg:hij");

url.hostname = 'dev.abc-1-de.net';

console.log(
  url.href
);
console.log(
  String(url)
);

<!-- end snippet -->