code: function (mask) {
              var found_mask;
  
              if (typeof mask === "object") {
                 mask = (mask.nick||'*')+'!'+(mask.ident||'*')+'@'+(mask.hostname||'*');
              } else if (typeof mask === "string") {
                 mask = toUserMask(mask);
              }
  
              found_mask = this.ignore_list.find(function(entry) {
                  return entry.get('regex').test(mask);
              });
  
              return !!found_mask;
          }
docs: Check if a user is ignored. Accepts an object with nick, ident and hostname OR a string.