Precompile regex

[Dimitrij Denissenko]

Instead of compiling the regular expressions on each cycle, you should precompile them for improved performance, i.e.:

Instead of:

reg, _ := regexp.Compile("^rv:(.+)$")

You should declare a global and reusable:

var rvReg = regexp.MustCompile("^rv:(.+)$")

[Miquel Sabaté Solà]

@dim Thanks for the suggestion :)