运行golang代码时出错，缺少正则表达式软件包？

I'm trying to run some go (golang) code I have written and I keep on getting this error:

cannot find package "regex" in any of:
    /usr/local/go/src/pkg/regex (from $GOROOT)
    /gopath/src/regex (from $GOPATH)

Isn't regex included when one installs Go?

If not, where I can I find it and how can I install it?

It's called regexp, not regex: http://golang.org/pkg/regexp/