package main  
  
import (  
    "net/http"  
    "regexp"  
)  
  
func main() {  
    http.HandleFunc("/", route)  
    http.ListenAndServe(":8080", nil)  
}  
  
var num = regexp.MustCompile(`\d`)  
var str = regexp.MustCompile(`\w`)  
  
func route(w http.ResponseWriter, r *http.Request) {  
    switch {  
    case num.MatchString(r.URL.Path):  
        digits(w, r)  
    case str.MatchString(r.URL.Path):  
        str(w, r)  
    default:  
        w.Write([]byte("位置匹配项"))  
    }  
}  
  
func digits(w http.ResponseWriter, r *http.Request) {  
    w.Write([]byte("receive digits"))  
}  
  
func str(w http.ResponseWriter, r *http.Request) {  
    w.Write([]byte("receive string"))  
}