anchor.diff:  const organization = 'dart-lang';
   const repository = 'sdk';
   
  -// Regular expressions for matching the request URI
  -final issueRegExp = RegExp(r'^/([0-9]+)$');
  -final newRegExp = RegExp(r'^/new$', caseSensitive: false);
  -final assignedRegExp = RegExp(r'^/assigned/([A-Za-z0-9\-]+)$');
  -final openedRegExp = RegExp(r'^/opened/([A-Za-z0-9\-]+)$');
  -final areaRegExp = RegExp(r'^/area/([A-Za-z0-9\-]+)$');
  -final triageRegExp = RegExp(r'^/triage$', caseSensitive: false);
  -
   // Redirect URIs
   final _rootUri = '$gitHub/$organization/$repository';
   final _listIssues = Uri.parse('$_rootUri/issues');
  
positive.code: final _newIssue = Uri.parse('$_rootUri/issues/new');
  final _assignedIssues = Uri.parse('$_rootUri/issues/assigned/');
  final _openedIssues = Uri.parse('$_rootUri/issues/created_by/');
  
  String _checkMatch(RegExp re, String path) {
    var match = re.firstMatch(path);
  
negative.code: ///
  /// Returns the [Uri] to redirect to or `null` if no redirect is defined.
  Uri findRedirect(Uri requestUri) {
    if (requestUri.pathSegments.isEmpty) {
      return _listIssues;
    }
  
    for (var entry in _matchers.entries) {
      var match = _checkMatch(entry.key, requestUri.path);
      if (match != null) {
        return entry.value(match);
      }
    }
  
    // No redirect found.
  