Removing extra dashes

[mariarosalesGL]

I'm using something like this
r301 %r{(.*)/(/+)(.*)}, '$1$2$3'
And let's use this example
http://localhost:3000//something
according to that regex I'll have

[0]: http://localhost:3000//something
[1]: http://localhost:3000
[2]: /
[3]: something
so If I took $1$2$3 should work.. but it doesn't is still the same without the re-wrtite, let me know what's wrong or how to deal with this situation
Thanks