How Can I Use Regular Expressions to Route URLs in Go?

Using Regular Expressions for URL Pattern Matching in Go

Question:

How can I utilize regular expressions to determine the appropriate function for URL processing in a Go program?

Answer:

The provided code demonstrates the use of http.HandleFunc with a fixed path or rooted subtree. To use regular expressions for URL matching, register a handler to a rooted subtree and perform regexp matching within the handler.

Here's an example:

func main() {
    http.HandleFunc("/", route) // Match everything
    http.ListenAndServe(":8080", nil)
}

var rNum = regexp.MustCompile(`\d`)  // Has digit(s)
var rAbc = regexp.MustCompile(`abc`) // Contains "abc"

func route(w http.ResponseWriter, r *http.Request) {
    switch {
    case rNum.MatchString(r.URL.Path):
        digits(w, r)
    case rAbc.MatchString(r.URL.Path):
        abc(w, r)
    default:
        w.Write([]byte("Unknown Pattern"))
    }
}

func digits(w http.ResponseWriter, r *http.Request) {
    w.Write([]byte("Has digits"))
}

func abc(w http.ResponseWriter, r *http.Request) {
    w.Write([]byte("Has abc"))
}

Alternatively, consider using an external library such as Gorilla MUX for more flexibility in URL matching.

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