I have a client with a Drupal 8 site who prefers curly quotes to straight quotes. I have successfully made this change for node titles using a regex replacement in template_preprocess_page_title. Now I am trying to accomplish the same thing for a different text field that is rendered by a view, using template_preprocess_views_view_field or template_preprocess_views_view_fields, but for the life of me I cannot figure out how to get individual field values using this function. Am I even trying the correct preprocess functions?
I have also tried rewriting the output of the field by accessing the variable in a custom twig template, with poor results.