How to do URL matching regex for routing framework?

I already have a routing method that matches this pattern:

/hello/:name

that set name to be a dynamic path, I want to know how to make it:

/hello/{name}    

with the same regex. How to add optional trailing slash to it, like this?

/hello/:name(/)

or

/hello/{name}(/)

This is the regex I use for /hello/:name

@^/hello/([a-zA-Z0-9\-\_]+)$@D

The regex is auto generated from PHP class

private function getRegex($pattern){
        $patternAsRegex = "@^" . preg_replace('/\\\:[a-zA-Z0-9\_\-]+/', '([a-zA-Z0-9\-\_]+)', preg_quote($pattern)) . "$@D";
        return $patternAsRegex;
    }

If the route is /hello/:name(/) I want it to make the match with optional thing else continue normal