parse static method
Implementation
static TwitterUserUrl? parse(String url) {
var matches = RegExp(
r'(?:https?:)?\/\/(?:[A-z]+\.)?twitter\.com\/@?(?!home|share|privacy|tos)(?<username>[A-z0-9_]+)\/?')
.allMatches(url);
var username = matches.getValue("username");
if (username == null) return null;
return TwitterUserUrl._(username);
}