es                      Expression substitution
matches                 Extract matching substrings
ore                     Oniguruma regular expressions
ore_dict                Get or set entries in the pattern dictionary
ore_escape              Escape regular expression special characters
ore_file                Use a file as a text source
ore_ismatch             Does text match a regex?
ore_lastmatch           Retrieve the last match
ore_search              Search for matches to a regular expression
ore_split               Split strings using a regex
ore_subst               Replace matched substrings with new text
ore_switch              String multiplexing
