Fix panic on routing with parameters

There is a bug on your `utils.getRegex`. The `strings.Split` there may return a first segment of empty string, please read the documentation of [strings.Split](https://golang.org/pkg/strings/#Split).

**Screenshot before this PR**

![](https://dev-to-uploads.s3.amazonaws.com/i/8cjq6caln2b09115laau.png)

**Screenshot after this PR**

![](https://dev-to-uploads.s3.amazonaws.com/i/a31qo84v6fjc93qmlg81.png)

utils.go

@@ -35,6 +35,9 @@ func getRegex(path string) (*regexp.Regexp, error) {
 	pattern := "^"
 	segments := strings.Split(path, "/")
 	for _, s := range segments {
+		if s == "" {
+			continue
+		}
 		if s[0] == ':' {
 			if strings.Contains(s, "?") {
 				pattern += "(?:/([^/]+?))?"