How to Match URLs with Regular Expressions in Go?

Matching URLs with Regular Expressions in Go

In Go, http.HandleFunc() is designed to handle specific URL patterns. However, it's not suitable for matching patterns using regular expressions.

Alternative Solutions:

Instead, consider the following solutions:

1. HandleFunc() with Rooted Subtree: Assign a handler to a root subtree (e.g., "/") and perform regexp matching within the handler function itself.

// Match everything
http.HandleFunc("/", route)

var rNum = regexp.MustCompile(`\d`)  // Has digit(s)

func route(w http.ResponseWriter, r *http.Request) {
    if rNum.MatchString(r.URL.Path) {
        digits(w, r)
    } else {
        w.Write([]byte("No digits found"))
    }
}

2. External Library: Utilize external libraries like Gorilla MUX (github.com/gorilla/mux), which provides more control over routing and supports regular expression matching.

For example, with Gorilla MUX:

r := mux.NewRouter()
r.HandleFunc("/digits", digitsHandler).Methods("GET")
r.HandleFunc("/abc", abcHandler).Methods("POST")

http.Handle("/", r)

Each of these methods allows for more detailed URL matching based on specific requirements.

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