parse static method
Implementation
static StackoverflowQuestionUrl? parse(String url) {
var matches = RegExp(
r'^(?:https?:)?\/\/(?:www\.)?stackoverflow\.com\/questions\/(?<id>[0-9]+)\/(?<title>[A-z0-9-_.]+)\/?$')
.allMatches(url);
var id = matches.getValue("id");
var title = matches.getValue("title");
if (id == null) return null;
return StackoverflowQuestionUrl._(id, title);
}