Handy tool to replace almost any data in wordpress, just put this in yout theme's directory and add a custom page with the template 'script' and go crazy. This one removes anchor links from Content column of post type 'series'.

wordpress_find_replace_meta.php

<?php
/*
Template Name: script
*/
 
if ( trim($_GET["key"]) == "DKGJWOIGJDLGDFSDF") {
    // Create the WP_User_Query object
$args = array(  
       'post_type' => 'series',
       'post_status' => 'publish',
       'posts_per_page' => 2000,
       ‘orderby’ => ‘title’,
       ‘order’ => ‘ASC’,
   );
 
   $loop = new WP_Query( $args );
     
   while ( $loop->have_posts() ) : $loop->the_post();


   echo "==== " . get_the_ID() . " ==== " . get_the_Title() . "<br><br>";
       $new_cont = get_the_content();
       $new_cont = preg_replace('/<\/?a[^>]*>/','',$new_cont);
       $my_post = array(
                'ID'           => get_the_ID(),
                'post_content' => $new_cont,
            );
            
            // Update the post into the database
            wp_update_post( $my_post );

   endwhile;

   wp_reset_postdata();

    
     }else{

echo "Access denied";

}