val capitalize : string -> string
val lowercase : string -> string
val uncapitalize : string -> string
val uppercase : string -> string
include String
val get : string -> int -> char
val length : string -> int
val unsafe_get : string -> int -> char
val max_length : int
val (^) : string -> string -> string
val blit : src:string -> src_pos:int -> dst:bytes -> dst_pos:int -> len:int -> unit
val compare : Base__.Import0.Caml.String.t -> Base__.Import0.Caml.String.t -> int
val copy : string -> string
val escaped : string -> string
val index_exn : string -> char -> int
val index_from_exn : string -> int -> char -> int
val make : int -> char -> string
val rindex_exn : string -> char -> int
val rindex_from_exn : string -> int -> char -> int
val sub : string -> pos:int -> len:int -> string
val unsafe_blit : src:string -> src_pos:int -> dst:bytes -> dst_pos:int -> len:int -> unit
val concat : ?sep:string -> string list -> string
val iter : string -> f:(char -> unit) -> unit