Previous  Up  Next

Module String


module String: sig .. end
String operations.
val length : string -> int
Return the length (number of characters) of the given string.
val get : string -> int -> char
String.get s n returns character number n in string s. The first character is character number 0. The last character is character number String.length s - 1. You can also write s.[n] instead of String.get s n.

Raise Invalid_argument "index out of bounds" if n is outside the range 0 to (String.length s - 1).

val set : string -> int -> char -> unit
String.set s n c modifies string s in place, replacing the character number n by c. You can also write s.[n] <- c instead of String.set s n c. Raise Invalid_argument "index out of bounds" if n is outside the range 0 to (String.length s - 1).
val create : int -> string
String.create n returns a fresh string of length n. The string initially contains arbitrary characters. Raise Invalid_argument if n < 0 or n > Sys.max_string_length.
val make : int -> char -> string
String.make n c returns a fresh string of length n, filled with the character c. Raise Invalid_argument if n < 0 or n > Sys.max_string_length.
val copy : string -> string
Return a copy of the given string.
val sub : string -> int -> int -> string
String.sub s start len returns a fresh string of length len, containing the characters number start to start + len - 1 of string s. Raise Invalid_argument if start and len do not designate a valid substring of s; that is, if start < 0, or len < 0, or start + len > String.length s.
val fill : string -> int -> int -> char -> unit
String.fill s start len c modifies string s in place, replacing the characters number start to start + len - 1 by c. Raise Invalid_argument if start and len do not designate a valid substring of s.
val blit : string -> int -> string -> int -> int -> unit
String.blit src srcoff dst dstoff len copies len characters from string src, starting at character number srcoff, to string dst, starting at character number dstoff. It works correctly even if src and dst are the same string, and the source and destination chunks overlap. Raise Invalid_argument if srcoff and len do not designate a valid substring of src, or if dstoff and len do not designate a valid substring of dst.
val concat : string -> string list -> string
String.concat sep sl concatenates the list of strings sl, inserting the separator string sep between each.
val iter : (char -> unit) -> string -> unit
String.iter f s applies function f in turn to all the characters of s. It is equivalent to f s.[0]; f s.[1]; ...; f s.[String.length s - 1]; ().
val escaped : string -> string
Return a copy of the argument, with special characters represented by escape sequences, following the lexical conventions of Objective Caml. If there is no special character in the argument, return the original string itself, not a copy.
val index : string -> char -> int
String.index s c returns the position of the leftmost occurrence of character c in string s. Raise Not_found if c does not occur in s.
val rindex : string -> char -> int
String.rindex s c returns the position of the rightmost occurrence of character c in string s. Raise Not_found if c does not occur in s.
val index_from : string -> int -> char -> int
Same as String.index, but start searching at the character position given as second argument. String.index s c is equivalent to String.index_from s 0 c.
val rindex_from : string -> int -> char -> int
Same as String.rindex, but start searching at the character position given as second argument. String.rindex s c is equivalent to String.rindex_from s (String.length s - 1) c.
val contains : string -> char -> bool
String.contains s c tests if character c appears in the string s.
val contains_from : string -> int -> char -> bool
String.contains_from s start c tests if character c appears in the substring of s starting from start to the end of s. Raise Invalid_argument if start is not a valid index of s.
val rcontains_from : string -> int -> char -> bool
String.rcontains_from s stop c tests if character c appears in the substring of s starting from the beginning of s to index stop. Raise Invalid_argument if stop is not a valid index of s.
val uppercase : string -> string
Return a copy of the argument, with all lowercase letters translated to uppercase, including accented letters of the ISO Latin-1 (8859-1) character set.
val lowercase : string -> string
Return a copy of the argument, with all uppercase letters translated to lowercase, including accented letters of the ISO Latin-1 (8859-1) character set.
val capitalize : string -> string
Return a copy of the argument, with the first character set to uppercase.
val uncapitalize : string -> string
Return a copy of the argument, with the first character set to lowercase.
type t = string
An alias for the type of strings.
val compare : t -> t -> int
The comparison function for strings, with the same specification as compare. Along with the type t, this function compare allows the module String to be passed as argument to the functors Set.Make and Map.Make.