martini 库中的路由匹配

[老青蛙嘎嘎嘎]

下面这段代码摘自martini库

+func newRoute(method string, pattern string, handlers []Handler) route {
 +	route := route{method, nil, handlers}
 +	r := regexp.MustCompile(`:[^/#?()\.\\]+`)
 +	pattern = r.ReplaceAllStringFunc(pattern, func(m string) string {
 +		return fmt.Sprintf(`(?P<%s>[^/#?]+)`, m[1:len(m)])
 +
 +	})
 +	pattern += `\/?`
 +	route.regex = regexp.MustCompile(pattern)
 +	return route
 +}

谁能解释下其中的正则表达式啊？