val length : 'a string -> 'a int
Return the length (number of characters) of the given string.
val get : 'a string -> 'a int -> 'a 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
.
Terminate the program if n
is outside the range
0 to (String.length s - 1)
.
You can also write s.[n]
instead of String.get s n
.
val make : 'a int -> 'a char -> 'a string
String.make n c
returns a fresh string of length n
,
filled with the character c
.
Terminate the program if n < 0
or n >
Sys.max_string_length
.
val sub : 'a string -> 'a int -> 'a int -> 'a 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
.
Terminate the program 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 concat : 'a string -> ('a string, 'a) list -> 'a string
String.concat sep sl
concatenates the list of strings sl
,
inserting the separator string sep
between each.
val iter : ('a char -{'b | 'c | 'b}-> 'd) -> 'a string -{'b | 'c |}-> unit
with 'a, content('c) < 'b
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 escaped : 'a string -> 'a string
Return a copy of the argument, with special characters
represented by escape sequences, following the lexical
conventions of Objective Caml. If there is no special
character in the argument, return the original string itself,
not a copy.
val index : 'a string -> 'a char -{'b | Not_found: 'b |}-> 'a int
with 'a < 'b
String.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 : 'a string -> 'a char -{'b | Not_found: 'b |}-> 'a int
with 'a < 'b
String.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 : 'a string -> 'a char -{'b | Not_found: 'b |}-> 'a int
with 'a < 'b
Same as String.index
, but start
searching at the character position given as second argument.
String.index s c
is equivalent to String.index_from s 0 c
.
val rindex_from : 'a string -> 'a char -{'b | Not_found: 'b |}-> 'a int
with 'a < 'b
Same as String.rindex
, but start
searching at the character position given as second argument.
String.rindex s c
is equivalent to
String.rindex_from s (String.length s - 1) c
.
val contains : 'a string -> 'a char -> 'a bool
String.contains s c
tests if character c
appears in the string s
.
val contains_from : 'a string -> 'a char -> 'a int -> 'a bool
String.contains_from s start c
tests if character c
appears in the substring of s
starting from start
to the end
of s
.
Terminate the program if start
is not a valid index of s
.
val rcontains_from : 'a string -> 'a char -> 'a int -> 'a bool
String.rcontains_from s stop c
tests if character c
appears in the substring of s
starting from the beginning
of s
to index stop
.
Terminate the program if stop
is not a valid index of s
.
val uppercase : 'a string -> 'a 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 : 'a string -> 'a 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 : 'a string -> 'a string
Return a copy of the argument, with the first letter set to uppercase.
val uncapitalize : 'a string -> 'a string
Return a copy of the argument, with the first letter set to lowercase.