Module String: 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. Raise Invalid_argument if n is ouside the range 0 to (String.length s - 1). You can also write s.[n] instead of String.get s n.

val set : string -> int -> char -> unit

String.set s n c modifies string s in place, replacing the character number n by c. Raise Invalid_argument if n is ouside the range 0 to (String.length s - 1). You can also write s.[n] <- c instead of String.set s n c.

val create : int -> string

String.create n returns a fresh string of length n. The string initially contains arbitrary characters.

val make : int -> char -> string

String.make n c returns a fresh string of length n, filled with the character c.

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 catenates the list of strings sl, inserting the separator string sep between each.

val escaped: string -> string

Return a copy of the argument, with special characters represented by escape sequences, following the lexical conventions of Objective Caml.

val index: string -> char -> int

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

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
val rindex_from: string -> int -> char -> int

Same as index and rindex, but start searching at the character position given as second argument. index s c is equivalent to index_from s 0 c, and rindex s c to rindex_from s (String.length s - 1) c.

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 letter set to uppercase.

val uncapitalize: string -> string

Return a copy of the argument, with the first letter set to lowercase.