WP_Rewrite::generate_rewrite_rules( string $permalink_structure, int $ep_mask = EP_NONE, bool $paged = true, bool $feed = true, bool $forcomments = false, bool $walk_dirs = true, bool $endpoints = true ): string[]

874	public function generate_rewrite_rules( $permalink_structure, $ep_mask = EP_NONE, $paged = true, $feed = true, $forcomments = false, $walk_dirs = true, $endpoints = true ) {875		// Build a regex to match the feed section of URLs, something like (feed|atom|rss|rss2)/?876		$feedregex2 = '';877		foreach ( (array) $this->feeds as $feed_name ) {878			$feedregex2 .= $feed_name . '|';879		}880		$feedregex2 = '(' . trim( $feedregex2, '|' ) . ')/?$';881 882		/*883		 * $feedregex is identical but with /feed/ added on as well, so URLs like <permalink>/feed/atom884		 * and <permalink>/atom are both possible885		 */886		$feedregex = $this->feed_base . '/' . $feedregex2;887 888		// Build a regex to match the trackback and page/xx parts of URLs.889		$trackbackregex = 'trackback/?$';890		$pageregex      = $this->pagination_base . '/?([0-9]{1,})/?$';891		$commentregex   = $this->comments_pagination_base . '-([0-9]{1,})/?$';892		$embedregex     = 'embed/?$';893 894		// Build up an array of endpoint regexes to append => queries to append.895		if ( $endpoints ) {896			$ep_query_append = array();897			foreach ( (array) $this->endpoints as $endpoint ) {898				// Match everything after the endpoint name, but allow for nothing to appear there.899				$epmatch = $endpoint[1] . '(/(.*))?/?$';900 901				// This will be appended on to the rest of the query for each dir.902				$epquery                     = '&' . $endpoint[2] . '=';903				$ep_query_append[ $epmatch ] = array( $endpoint[0], $epquery );904			}905		}906 907		// Get everything up to the first rewrite tag.908		$front = substr( $permalink_structure, 0, strpos( $permalink_structure, '%' ) );909 910		// Build an array of the tags (note that said array ends up being in $tokens[0]).911		preg_match_all( '/%.+?%/', $permalink_structure, $tokens );912 913		$num_tokens = count( $tokens[0] );914 915		$index          = $this->index; // Probably 'index.php'.916		$feedindex      = $index;917		$trackbackindex = $index;918		$embedindex     = $index;919 920		/*921		 * Build a list from the rewritecode and queryreplace arrays, that will look something922		 * like tagname=$matches[i] where i is the current $i.923		 */924		$queries = array();925		for ( $i = 0; $i < $num_tokens; ++$i ) {926			if ( 0 < $i ) {927				$queries[ $i ] = $queries[ $i - 1 ] . '&';928			} else {929				$queries[ $i ] = '';930			}931 932			$query_token    = str_replace( $this->rewritecode, $this->queryreplace, $tokens[0][ $i ] ) . $this->preg_index( $i + 1 );933			$queries[ $i ] .= $query_token;934		}935 936		// Get the structure, minus any cruft (stuff that isn't tags) at the front.937		$structure = $permalink_structure;938		if ( '/' !== $front ) {939			$structure = str_replace( $front, '', $structure );940		}941 942		/*943		 * Create a list of dirs to walk over, making rewrite rules for each level944		 * so for example, a $structure of /%year%/%monthnum%/%postname% would create945		 * rewrite rules for /%year%/, /%year%/%monthnum%/ and /%year%/%monthnum%/%postname%946		 */947		$structure = trim( $structure, '/' );948		$dirs      = $walk_dirs ? explode( '/', $structure ) : array( $structure );949		$num_dirs  = count( $dirs );950 951		// Strip slashes from the front of $front.952		$front = preg_replace( '|^/+|', '', $front );953