write_sexp fname s writes the list of strings s to the file fname in an appropriate format so that it can used in dune files with (:include [fname]).
write_lines fname s writes the list of string s to the file fname with one line per string so that it can be used in Dune action rules with %{read-lines:<path>}.
extract_comma_space_separated_words s returns a list of words in s that are separated by a newline, tab, space or comma character.
extract_blank_separated_words s returns a list of words in s that are separated by a tab or space character.
extract_words s ~is_word_char will split the string s into a list of words. A valid word character is defined by the is_word_char predicate returning true and anything else is considered a separator. Any blank words are filtered out of the results.