fix for empty query

mux_test.go

@@ -588,6 +588,15 @@ func TestQueries(t *testing.T) {
 			path:        "",
 			shouldMatch: false,
 		},
+		{
+			title:       "Queries route with empty value, should match",
+			route:       new(Route).Queries("foo", ""),
+			request:     newRequest("GET", "http://localhost?foo=bar"),
+			vars:        map[string]string{},
+			host:        "",
+			path:        "",
+			shouldMatch: true,
+		},
 	}
 
 	for _, test := range tests {

regexp.go

@@ -34,7 +34,7 @@ func newRouteRegexp(tpl string, matchHost, matchPrefix, matchQuery, strictSlash
 	// Now let's parse it.
 	defaultPattern := "[^/]+"
 	if matchQuery {
-		defaultPattern = "[^?&]+"
+		defaultPattern = "[^?&]*"
 	} else if matchHost {
 		defaultPattern = "[^.]+"
 		matchPrefix = false
@@ -89,6 +89,9 @@ func newRouteRegexp(tpl string, matchHost, matchPrefix, matchQuery, strictSlash
 	if strictSlash {
 		pattern.WriteString("[/]?")
 	}
+	if matchQuery && len(idxs) == 0 {
+		pattern.WriteString(defaultPattern)
+	}
 	if !matchPrefix {
 		pattern.WriteByte('$')
 	}