WordPress at a glance
filter is not described

author_rewrite_rules filter-hook . WP 1.5.0

Filters rewrite rules used for author archives.

Likely author archives would include /author/author-name/, as well as pagination and feed paths for author archives.

Usage

add_filter( 'author_rewrite_rules', 'filter_function_name_8977' );
function filter_function_name_8977( $author_rewrite ){
	// filter...

	return $author_rewrite;
}
$author_rewrite(array)
The rewrite rules for author archives.

Where the hook is called

WP_Rewrite::rewrite_rules()
author_rewrite_rules
wp-includes/class-wp-rewrite.php 1331
$author_rewrite = apply_filters( 'author_rewrite_rules', $author_rewrite );

Where the hook is used (in WP core)

Does not used.