StringLabels(3)

NAME
StringLabels - String operations.

Module
Module StringLabels

Documentation

Module StringLabels
 : 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 the character at index n in string s . You can also write s.[n] instead of String.get s n .

Raise Invalid_argument if n not a valid index in s .

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

Deprecated. This is a deprecated alias of BytesLabels.set .

String.set s n c modifies byte sequence s in place, replacing the byte at index n with c . You can also write s.[n] <- c instead of String.set s n c .

Raise Invalid_argument if n is not a valid index in s .

val create : int -> bytes

Deprecated. This is a deprecated alias of BytesLabels.create .

String.create n returns a fresh byte sequence of length n . The sequence is uninitialized and contains arbitrary bytes.

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 init : int -> f:(int -> char) -> string

init n f returns a string of length n , with character i initialized to the result of f i .

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 -> pos:int -> len:int -> string

String.sub s start len returns a fresh string of length len , containing the substring of s that starts at position start and has length len .

Raise Invalid_argument if start and len do not designate a valid substring of s .

val fill : bytes -> pos:int -> len:int -> char -> unit

Deprecated. This is a deprecated alias of BytesLabels.fill .

String.fill s start len c modifies byte sequence s in place, replacing len bytes by c , starting at start .

Raise Invalid_argument if start and len do not designate a valid substring of s .

val blit : src:string -> src_pos:int -> dst:bytes -> dst_pos:int -> len:int -> unit

String.blit src srcoff dst dstoff len copies len bytes from the string src , starting at index srcoff , to byte sequence dst , starting at character number dstoff .

Raise Invalid_argument if srcoff and len do not designate a valid range of src , or if dstoff and len do not designate a valid range of dst .

val concat : sep:string -> string list -> string

String.concat sep sl concatenates the list of strings sl , inserting the separator string sep between each.

val iter : f:(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 iteri : f:(int -> char -> unit) -> string -> unit

Same as String.iter , but the function is applied to the index of the element as first argument (counting from 0), and the character itself as second argument.

Since 4.00.0

val map : f:(char -> char) -> string -> string

String.map f s applies function f in turn to all the characters of s and stores the results in a new string that is returned.

Since 4.00.0

val mapi : f:(int -> char -> char) -> string -> string

String.mapi f s calls f with each character of s and its index (in increasing index order) and stores the results in a new string that is returned.

Since 4.02.0

val trim : string -> string

Return a copy of the argument, without leading and trailing whitespace. The characters regarded as whitespace are: ' ' , '\012' , '\n' , '\r' , and '\t' . If there is no leading nor trailing whitespace character in the argument, return the original string itself, not a copy.

Since 4.00.0

val escaped : string -> string

Return a copy of the argument, with special characters represented by escape sequences, following the lexical conventions of OCaml. If there is no special character in the argument, return the original string itself, not a copy. Its inverse function is Scanf.unescaped.

val index : string -> char -> int

String.index s c returns the index of the first 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 index of the last occurrence of character c in string s .

Raise Not_found if c does not occur in s .

val index_from : string -> int -> char -> int

String.index_from s i c returns the index of the first occurrence of character c in string s after position i . String.index s c is equivalent to String.index_from s 0 c .

Raise Invalid_argument if i is not a valid position in s . Raise Not_found if c does not occur in s after position i .

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

String.rindex_from s i c returns the index of the last occurrence of character c in string s before position i+1 . String.rindex s c is equivalent to String.rindex_from s (String.length s - 1) c .

Raise Invalid_argument if i+1 is not a valid position in s . Raise Not_found if c does not occur in s before position i+1 .

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 s after position start . String.contains s c is equivalent to String.contains_from s 0 c .

Raise Invalid_argument if start is not a valid position in s .

val rcontains_from : string -> int -> char -> bool

String.rcontains_from s stop c tests if character c appears in s before position stop+1 .

Raise Invalid_argument if stop < 0 or stop+1 is not a valid position in 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 Pervasives.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 .