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`sig type t = string exception Invalid of string * string val check : string -> string option val validate : string -> unit val encode : ?encoding:Encoding.t -> Text.t -> string val decode : ?encoding:Encoding.t -> string -> Text.t val to_ascii : Text.t -> Text.t val length : Text.t -> int val code : Text.t -> int val char : int -> Text.t val get : Text.t -> int -> Text.t val sub : Text.t -> int -> int -> Text.t val slice : Text.t -> int -> int -> Text.t val splice : Text.t -> int -> int -> Text.t -> Text.t val repeat : int -> Text.t -> Text.t val init : int -> (int -> Text.t) -> Text.t val rev_init : int -> (int -> Text.t) -> Text.t val upper : Text.t -> Text.t val lower : Text.t -> Text.t val capitalize : Text.t -> Text.t val uncapitalize : Text.t -> Text.t val compare : Text.t -> Text.t -> int val icompare : Text.t -> Text.t -> int val transform : Text.t -> Text.t val rev : Text.t -> Text.t val concat : Text.t -> Text.t list -> Text.t val rev_concat : Text.t -> Text.t list -> Text.t val explode : Text.t -> Text.t list val rev_explode : Text.t -> Text.t list val implode : Text.t list -> Text.t val rev_implode : Text.t list -> Text.t val is_ascii : Text.t -> bool val is_alnum : Text.t -> bool val is_alpha : Text.t -> bool val is_blank : Text.t -> bool val is_cntrl : Text.t -> bool val is_digit : Text.t -> bool val is_graph : Text.t -> bool val is_lower : Text.t -> bool val is_print : Text.t -> bool val is_punct : Text.t -> bool val is_space : Text.t -> bool val is_upper : Text.t -> bool val is_xdigit : Text.t -> bool val map : (Text.t -> Text.t) -> Text.t -> Text.t val rev_map : (Text.t -> Text.t) -> Text.t -> Text.t val fold : (Text.t -> 'a -> 'a) -> Text.t -> 'a -> 'a val rev_fold : (Text.t -> 'a -> 'a) -> Text.t -> 'a -> 'a val filter : (Text.t -> bool) -> Text.t -> Text.t val rev_filter : (Text.t -> bool) -> Text.t -> Text.t val iter : (Text.t -> unit) -> Text.t -> unit val rev_iter : (Text.t -> unit) -> Text.t -> unit val for_all : (Text.t -> bool) -> Text.t -> bool val exists : (Text.t -> bool) -> Text.t -> bool val count : (Text.t -> bool) -> Text.t -> int val words : Text.t -> Text.t list val lines : Text.t -> Text.t list val split : ?max:int -> ?sep:Text.t -> Text.t -> Text.t list val rev_split : ?max:int -> ?sep:Text.t -> Text.t -> Text.t list val replace : Text.t -> patt:Text.t -> repl:Text.t -> Text.t val contains : Text.t -> Text.t -> bool val starts_with : Text.t -> Text.t -> bool val ends_with : Text.t -> Text.t -> bool val strip : ?chars:Text.t list -> Text.t -> Text.t val rstrip : ?chars:Text.t list -> Text.t -> Text.t val lstrip : ?chars:Text.t list -> Text.t -> Text.t val rchop : Text.t -> Text.t val lchop : Text.t -> Text.t type pointer val pointer_l : Text.t -> Text.pointer val pointer_r : Text.t -> Text.pointer val pointer_at : Text.t -> int -> Text.pointer val next : Text.pointer -> (Text.t * Text.pointer) option val prev : Text.pointer -> (Text.t * Text.pointer) option val move : int -> Text.pointer -> Text.pointer val chunk : Text.pointer -> Text.pointer -> Text.t val offset : Text.pointer -> int val position : Text.pointer -> int val equal_at : Text.pointer -> Text.t -> bool val find : ?from:Text.pointer -> Text.t -> Text.t -> Text.pointer option val rev_find : ?from:Text.pointer -> Text.t -> Text.t -> Text.pointer option end`