parse static method
Implementation
static SnapchatUrl? parse(String url) {
var matches = RegExp(
r'(?:https?:)?\/\/(?:www\.)?snapchat\.com\/add\/(?<username>[A-z0-9\.\_\-]+)\/?')
.allMatches(url);
var username = matches.getValue("username");
if (username == null) return null;
return SnapchatUrl._(username);
}