woocommerce_email_format_string_find filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_email_format_string_find', 'filter_function_name_9134', 10, 2 );
function filter_function_name_9134( $legacy_find, $that ){
	// filter...

	return $legacy_find;
}

$legacy_find

-

$that

-

Where the hook is called

$string = str_replace( apply_filters( 'woocommerce_email_format_string_find', $legacy_find, $this ), apply_filters( 'woocommerce_email_format_string_replace', $legacy_replace, $this ), $string );

Where in WP core the hook is used WooCommerce