regex - Regular Expression for getting everything after last slash

I was browsing stackoverflow and have noticed a regular expression for matching everything after last slash is

([^/]+$)

So for example if you have http://www.blah.com/blah/test
The reg expression will extract 'test' without single quotes.

My question is why does it do it? Doesn't ^/ mean beginning of a slash?

EDIT:
I guess I do not understand how +$ grabs "test". + repeats the previous item once or more so it ignores all data between all the / slashes. how does then $ extract the test

Answer

No, an ^ inside [] means negation.

[/] stands for 'any character in set [/]'.

[^/] stands for 'any character not in set [/]'.