Better "verbose" rewrite rules for pages?

better-verbose-rewrite-rules.php

/** 
 * Verbose rewrite rules are required when there is a potential conflict between the slug of a page and the slug of 
 * another content type like a post type. 
 *
 * WordPress needs to know first and foremost that they do not need to seek out a page when the front portion of a url 
 * has a value that matches the 'rewrite slug' of a CPT. 
 * We can avoid this by building the page rewrite rules to specifically ignore all instances where these match with the
 * below code: 
 **/
 
 function ignore_cpts_as_pages($rules){
 
  //filter to override and make your own list to force ignore
  $slugs_list = apply_filters('exclude_slugs_for_pages'); 
  
  if(empty($slugs_list)){
  
    $args = array(
      'public' => true, 
      'publicly_queryable' => true,
      'rewrite' => true //not sure if this is valid. Goal is to check if 'rewrite' has a value, not that it's value is true
    );
    
    $cpts = get_post_types( $args, 'objects', '' );
    
    //filter to allow customing, cleaning, or altering the list of CPT slugs
    $slugs_list = apply_filters('exclude_cpt_slugs_for_pages', $cpts); 
  }  
   
  // build the list to ignore 
  foreach($cpts as $cpt){
    $slug_to_ignore = $cpt->rewrite['slug'];
    $appended .= '(?!'.$slug_to_ignore.')';
  }
  
  $new_rules = array();

  foreach($rules as $k => $v){
    $new_rules[$appended.$k] = $v;
  }
  
  return $new_rules; 
} 

/**
 * The resulting rules will look like the below regex
 * where the slug for each CPT is a negative lookahead appended to the beginning
 * of the standard page rewrite rule
 *
 *
 * ~^/(?!events)(?!features)(?!sites)(?!galleries)(?!back\-issues)(.?.+?)(?:/([0-9]+))?/?$~
 * 
 * /something/42346/  <~~ page query
 * /events/something/42346/   <~~ ignore page query
 * /features/sdomg/woies <~~ ignore page query
 * /something/sdlfisdf  <~~ page query 
 *
 **/