Golang中的正则表达式：如何设置使字符串不匹配的字符？(Regex in Golang: How to set character that makes the string not match?)

I am a noob about regular expressions (sorry). I was trying to make a very simple markup language that matches bold and italic and then converts them to HTML. Here is an example for bold that I'm using:

var bold = regexp.MustCompile("\\*([^\\*]+)\\*")

*test*\*test*