RegexNamedGroupRoutingConstraint.cs

public class RegexNamedGroupRoutingConstraint : IRouteConstraint
{
    private readonly List<Regex> regexes = new List<Regex>();

    public RegexNamedGroupRoutingConstraint(params string[] regexes)
    {
        foreach (var regex in regexes)
        {
            this.regexes.Add(new Regex(regex));
        }
    }

    public bool Match(HttpContext httpContext, IRouter route, string routeKey, RouteValueDictionary values, RouteDirection routeDirection)
    {
        if (values[routeKey] == null)
        {
            return false;
        }

        var url = values[routeKey].ToString();

        foreach (var regex in regexes)
        {
            var match = regex.Match(url);
            if (match.Success)
            {
                foreach (Group group in match.Groups)
                {
                    values.Add(group.Name, group.Value);
                }

                return true;
            }
        }

        return false;
    }
}