code: protected function extractFieldAliases(array $data)
      {
          foreach ($data as $field => $fieldRules) {
              $extraction = explode('|', $field);
  
              if (isset($extraction[1])) {
                  $updatedField = $extraction[0];
                  $alias        = $extraction[1];
  
                  $this->fieldAliases[$updatedField] = $alias;
                  $data[$updatedField] = $data[$field];
                  unset($data[$field]);
              }
          }
  
          return $data;
      }
docs: Extracts field aliases from an input.
  
  @param  array  $data
  
  @return array