WP_MatchesMapRegex
Helper class to remove the need to use eval to replace $matches[] in query strings.
WordPress File wp-includes/class-wp-matchesmapregex.php
WP_MatchesMapRegex::__construct()
constructor
WP_MatchesMapRegex::_map()
do the actual mapping
WP_MatchesMapRegex::apply()
Substitute substring matches in subject.
WP_MatchesMapRegex::callback()
preg_replace_callback hook