Why is the selected pattern not being searched?

Question

JavaScript

String "hello world 2000 00:00:00 50 users"
RegExp replace(/^(\d\d:\d\d:\d\d)/g, "")
Why doesn't it delete all elements in the string except 00:00:00?

As far as I understood, what we wrote in () is a single whole, and ^in front of it means, except, i.e. replace everything except

Answer 1

https://regex101.com/r/1mb9Jp/1

Answer 2

not really, in this case ^ at the beginning of the line, you need to use this syntax
/[^(\d\d:\d\d:\d\d)]/g
https://regex101.com/ good site for checking regex