Can You Use Wildcards in `http.HandleFunc` Patterns?

Handler Patterns in HTTP Server

When utilizing http.HandleFunc, the question arises whether it's possible to incorporate wildcards into the pattern. For instance, you may desire a pattern like "/groups//people" where the asterisk () represents any valid URL segment.

HTTP Handler Pattern Limitations

Unfortunately, http.Handler patterns are not regular expressions or globs, hence wildcards cannot be directly specified.

Custom Handler for Pattern Flexibility

To overcome this limitation, consider creating a custom HTTP handler that leverages regular expressions or other desired patterns. Here's an example with regular expressions:

import (
    "net/http"
    "regexp"
)

type RegexpHandler struct {
    routes []*route
}
type route struct {
    pattern *regexp.Regexp
    handler http.Handler
}

// Register handlers with custom patterns
func (h *RegexpHandler) Handler(pattern *regexp.Regexp, handler http.Handler) {
    h.routes = append(h.routes, &route{pattern, handler})
}
func (h *RegexpHandler) HandleFunc(pattern *regexp.Regexp, handler func(http.ResponseWriter, *http.Request)) {
    h.routes = append(h.routes, &route{pattern, http.HandlerFunc(handler)})
}

// Process HTTP requests and route to appropriate handler based on custom patterns
func (h *RegexpHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
    for _, route := range h.routes {
        if route.pattern.MatchString(r.URL.Path) {
            route.handler.ServeHTTP(w, r)
            return
        }
    }
    // No pattern matched, return 404
    http.NotFound(w, r)
}

func NewRegexpHandler() *RegexpHandler {
    return &RegexpHandler{routes: make([]*route, 0)}
}

This handler allows you to register custom patterns and handlers, providing flexibility to match URLs in a more dynamic manner. It can be seamlessly integrated with the default HTTP server:

http.Handle("/", NewRegexpHandler())

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