module StringLabels:sig..end
val length : string -> intReturn the length (number of characters) of the given string.
val get : string -> int -> charString.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 -> unitBytesLabels.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 -> bytesBytesLabels.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 -> stringString.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) -> stringinit 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 -> stringReturn a copy of the given string.
val sub : string -> pos:int -> len:int -> stringString.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 -> unitBytesLabels.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 -> unitString.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 -> stringString.concat sep sl concatenates the list of strings sl,
inserting the separator string sep between each.
val iter : f:(char -> unit) -> string -> unitString.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 -> unitSame 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.
val map : f:(char -> char) -> string -> stringString.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.
val mapi : f:(int -> char -> char) -> string -> stringString.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.
val trim : string -> stringReturn 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.
val escaped : string -> stringReturn 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 -> intString.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 index_opt : string -> char -> int optionString.index_opt s c returns the index of the first
occurrence of character c in string s, or
None if c does not occur in s.
val rindex : string -> char -> intString.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 rindex_opt : string -> char -> int optionString.rindex_opt s c returns the index of the last occurrence
of character c in string s, or None if c does not occur in
s.
val index_from : string -> int -> char -> intString.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 index_from_opt : string -> int -> char -> int optionString.index_from_opt s i c returns the index of the
first occurrence of character c in string s after position i
or None if c does not occur in s after position i.
String.index_opt s c is equivalent to String.index_from_opt s 0 c.
Raise Invalid_argument if i is not a valid position in s.
val rindex_from : string -> int -> char -> intString.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 rindex_from_opt : string -> int -> char -> int optionString.rindex_from_opt s i c returns the index of the
last occurrence of character c in string s before position i+1
or None if c does not occur in s before position i+1.
String.rindex_opt s c is equivalent to
String.rindex_from_opt s (String.length s - 1) c.
Raise Invalid_argument if i+1 is not a valid position in s.
val contains : string -> char -> boolString.contains s c tests if character c
appears in the string s.
val contains_from : string -> int -> char -> boolString.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 -> boolString.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 -> stringReturn 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 -> stringReturn 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 -> stringReturn a copy of the argument, with the first character set to uppercase, using the ISO Latin-1 (8859-1) character set..
val uncapitalize : string -> stringReturn a copy of the argument, with the first character set to lowercase, using the ISO Latin-1 (8859-1) character set..
val uppercase_ascii : string -> stringReturn a copy of the argument, with all lowercase letters translated to uppercase, using the US-ASCII character set.
val lowercase_ascii : string -> stringReturn a copy of the argument, with all uppercase letters translated to lowercase, using the US-ASCII character set.
val capitalize_ascii : string -> stringReturn a copy of the argument, with the first character set to uppercase, using the US-ASCII character set.
val uncapitalize_ascii : string -> stringReturn a copy of the argument, with the first character set to lowercase, using the US-ASCII character set.
typet =string
An alias for the type of strings.
val compare : t -> t -> intval equal : t -> t -> boolThe equal function for strings.
val split_on_char : sep:char -> string -> string listString.split_on_char sep s returns the list of all (possibly empty)
substrings of s that are delimited by the sep character.
The function's output is specified by the following invariants:
sep as a separator returns a
string equal to the input (String.concat (String.make 1 sep)
(String.split_on_char sep s) = s).sep character.val to_seq : t -> char Seq.tIterate on the string, in increasing index order. Modifications of the string during iteration will be reflected in the iterator.
val to_seqi : t -> (int * char) Seq.tIterate on the string, in increasing order, yielding indices along chars
val of_seq : char Seq.t -> tCreate a string from the generator