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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code | 
|---|---|
| 1539 |                                         '.*wp-feed.php$'     =>     $this->index .'?feed=feed', | 
| 1540 |                                         '.*wp-commentsrss2.php$'     =>     $this->index . '?feed=rss2&withcomments=1'); | 
| 1541 |  | 
| 1542 |           // Post | 
| 1543 |           $post_rewrite = $this->generate_rewrite_rules($this->permalink_structure, EP_PERMALINK); | 
| 1544 |           $post_rewrite = apply_filters('post_rewrite_rules', $post_rewrite); | 
| 1545 |  | 
| 1546 |           // Date | 
| 1547 |           $date_rewrite = $this->generate_rewrite_rules($this->get_date_permastruct(), EP_DATE); | 
| 1548 |           $date_rewrite = apply_filters('date_rewrite_rules', $date_rewrite); | 
| 1549 |  | 
| 1550 |           // Root | 
| 1551 |           $root_rewrite = $this->generate_rewrite_rules($this->root . '/', EP_ROOT); | 
| 1552 |           $root_rewrite = apply_filters('root_rewrite_rules', $root_rewrite); | 
| 1553 |  | 
| 1554 |           // Comments | 
| 1555 |           $comments_rewrite = $this->generate_rewrite_rules($this->root . $this->comments_base, EP_COMMENTS, true, true, true, false); | 
| 1556 |           $comments_rewrite = apply_filters('comments_rewrite_rules', $comments_rewrite); | 
| 1557 |  |