Module ExtLib.String

module String: ExtString.String

New Functions

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

init l f returns the string of length l with the chars f 0 , f 1 , f 2 ... f (l-1).

val find : string -> string -> int

find s x returns the starting index of the string x within the string s or raises Invalid_string if x is not a substring of s.

val find_from : string -> int -> string -> int

find s i x returns the starting index of the string x within the string s (starting search from position i) or raises Invalid_string if no such substring exists. find s x is equivalent to find_from s 0 x.

val split : string -> string -> string * string

split s sep splits the string s between the first occurrence of sep. raises Invalid_string if the separator is not found.

val nsplit : string -> string -> string list

nsplit s sep splits the string s into a list of strings which are separated by sep. nsplit "" _ returns the empty list.
Raises Invalid_string if sep is empty string.

val join : string -> string list -> string

Same as concat

val slice : ?first:int -> ?last:int -> string -> string

slice ?first ?last s returns a "slice" of the string which corresponds to the characters s.[first], s.[first+1], ..., s[last-1]. Note that the character at index last is not included! If first is omitted it defaults to the start of the string, i.e. index 0, and if last is omitted is defaults to point just past the end of s, i.e. length s. Thus, slice s is equivalent to copy s.

Negative indexes are interpreted as counting from the end of the string. For example, slice ~last:-2 s will return the string s, but without the last two characters.

This function never raises any exceptions. If the indexes are out of bounds they are automatically clipped.

val lchop : string -> string

Returns the same string but without the first character. does nothing if the string is empty.

val rchop : string -> string

Returns the same string but without the last character. does nothing if the string is empty.

val of_int : int -> string

Returns the string representation of an int.

val of_float : float -> string

Returns the string representation of an float.

val of_char : char -> string

Returns a string containing one given character.

val to_int : string -> int

Returns the integer represented by the given string or raises Invalid_string if the string does not represent an integer.

val to_float : string -> float

Returns the float represented by the given string or raises Invalid_string if the string does not represent a float.

val ends_with : string -> string -> bool

ends_with s x returns true if the string s is ending with x.

val starts_with : string -> string -> bool

starts_with s x return true if s is starting with x.

val enum : string -> char Enum.t

Returns an enumeration of the characters of a string.

val of_enum : char Enum.t -> string

Creates a string from a character enumeration.

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

map f s returns a string where all characters c in s have been replaced by f c. *

val fold_left : ('a -> char -> 'a) -> 'a -> string -> 'a

fold_left f a s is f (... (f (f a s.[0]) s.[1]) ...) s.[n-1]

val fold_right : (char -> 'a -> 'a) -> string -> 'a -> 'a

fold_right f s b is f s.[0] (f s.[1] (... (f s.[n-1] b) ...))

val explode : string -> char list

explode s returns the list of characters in the string s.

val implode : char list -> string

implode cs returns a string resulting from concatenating the characters in the list cs.

val strip : ?chars:string -> string -> string

Returns the string without the chars if they are at the beginning or at the end of the string. By default chars are " \t\r\n".

val exists : string -> string -> bool

exists str sub returns true if sub is a substring of str or false otherwise.

val replace_chars : (char -> string) -> string -> string

replace_chars f s returns a string where all chars c of s have been replaced by the string returned by f c.

val replace : str:string -> sub:string -> by:string -> bool * string

replace ~str ~sub ~by returns a tuple constisting of a boolean and a string where the first occurrence of the string sub within str has been replaced by the string by. The boolean is true if a subtitution has taken place.

Older Functions

Please refer to the Ocaml Manual for documentation of these functions.

val length : string -> int

val get : string -> int -> char

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

val create : int -> string

val make : int -> char -> string

val copy : string -> string

val sub : string -> int -> int -> string

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

val blit : string -> int -> string -> int -> int -> unit

val concat : string -> string list -> string

val iter : (char -> unit) -> string -> unit

val escaped : string -> string

val index : string -> char -> int

val rindex : string -> char -> int

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

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

val contains : string -> char -> bool

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

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

val uppercase : string -> string

val lowercase : string -> string

val capitalize : string -> string

val uncapitalize : string -> string

type t = string

val compare : t -> t -> int