You can search for identifiers within the package.
in-package search v0.2.0
val is_valid : char -> bool
val is_digit : char -> bool
val is_hex_digit : char -> bool
val is_upper : char -> bool
val is_lower : char -> bool
val is_letter : char -> bool
val is_alphanum : char -> bool
val is_white : char -> bool
val is_blank : char -> bool
val is_graphic : char -> bool
val is_print : char -> bool
val is_control : char -> bool
val uppercase : char -> char
val lowercase : char -> char
val escape : char -> string
val escape_char : char -> string