regex - How to simulate negative lookbehind in Go

Question

I'm trying to write a regex that can extract a command, here's what I've got so far using a negative lookbehind assertion:

(?<![@#/])w.*

So with the input:

/msg @nickname #channel foo bar baz
/foo #channel @nickname foo bar baz 
foo bar baz

foo bar baz is extracted every time. See working example https://regex101.com/r/lF9aG7/3

In Go however this doesn't compile http://play.golang.org/p/gkkVZgScS_

It throws:

panic: regexp: Compile(`(?<![@#/])w.*`): error parsing regexp: invalid or unsupported Perl syntax: `(?<`

I did a bit of research and realized negative lookbehinds are not supported in the language to guarantee O(n) time.

How can I rewrite this regex so that it does the same without negative lookbehind?

Answer 1

Waitting for answers