WordPress at a glance
filter is not described

excerpt_save_pre filter-hook . WP 1.0

This filter is documented in wp-includes/post.php

Usage

add_filter( 'excerpt_save_pre', 'filter_function_name_1336' );
function filter_function_name_1336( $wp_slash ){
	// filter...

	return $wp_slash;
}
$wp_slash
-

Where the hook is called

WP_Customize_Nav_Menu_Item_Setting::sanitize()
wp-includes/customize/class-wp-customize-nav-menu-item-setting.php 705
$menu_item_value['attr_title'] = wp_unslash( apply_filters( 'excerpt_save_pre', wp_slash( $menu_item_value['attr_title'] ) ) );

Where the hook is used (in WP core)

wp-includes/kses.php 1714
add_filter('excerpt_save_pre', 'wp_filter_post_kses');
wp-includes/kses.php 1740
remove_filter('excerpt_save_pre', 'wp_filter_post_kses');
wp-includes/default-filters.php 117
add_filter( $filter, 'convert_invalid_entities' );
wp-includes/default-filters.php 118
add_filter( $filter, 'balanceTags', 50 );