Just a simple way to search for things in a WordPress install. Allows for an easy way to search for locations where a shortcode is used

post-query-shortcode.php

<?php
function tas_search(){
    ob_start();

        //Searches by string
        $args = [
          's'              => 'yop_poll', //Or whatever
          'post_type'      => 'any',
          'posts_per_page' => -1,
        ];
  
  //Searches for a page template
  /*
      $args = [
        'post_type'      => 'page',
        'meta_key'       => '_wp_page_template',
        'meta_value'     => 'template-events.php', //Or whatever
        'posts_per_page' => -1,
      ];*/

    $the_query = new WP_Query($args);

    if($the_query->have_posts()){
      echo '<ul>';
      while($the_query->have_posts()){
        $the_query->the_post(); ?>
        <li><a href="<?php the_permalink() ?>"><?php the_title(); ?></a></li>
        <?php
      }
      echo '</ul>';
    }
    else{
      echo "Sorry no posts found";
    }

    wp_reset_postdata();

    return ob_get_clean();
  }

  add_shortcode('wpquery', 'tas_search');

Most of the credit for this goes to: http://www.wpbeginner.com/wp-tutorials/how-to-find-and-remove-unused-shortcodes-from-wordpress-posts