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Module StringLabels

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 : stringbytes -> int -> char -> unit
Deprecated.This is a deprecated alias of Bytes.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 -> stringbytes
Deprecated.This is a deprecated alias of Bytes.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 : stringbytes -> pos:int -> len:int -> char -> unit
Deprecated.This is a deprecated alias of Bytes.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:stringbytes -> 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 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.