Module String.Ascii

val is_valid : string -> bool
val uppercase : string -> string
val lowercase : string -> string
val capitalize : string -> string
val uncapitalize : string -> string
val to_hex : string -> string
val of_hex : string -> (string, int) result
val of_hex' : string -> (string, string) result
val escape : string -> string
val unescape : string -> (string, int) result
val ocaml_string_escape : string -> string
val ocaml_unescape : string -> (string, int) result