fn is_ascii(&self) -> bool
Checks if the value is within the ASCII range.
This method will be deprecated in favor of the identically-named
inherent methods on u8
, char
, [u8]
and str
.
Makes a copy of the value in its ASCII upper case equivalent.
ASCII letters 'a' to 'z' are mapped to 'A' to 'Z',
but non-ASCII letters are unchanged.
To uppercase the value in-place, use [make_ascii_uppercase
].
To uppercase ASCII characters in addition to non-ASCII characters, use
[str::to_uppercase
].
This method will be deprecated in favor of the identically-named
inherent methods on u8
, char
, [u8]
and str
.
Makes a copy of the value in its ASCII lower case equivalent.
ASCII letters 'A' to 'Z' are mapped to 'a' to 'z',
but non-ASCII letters are unchanged.
To lowercase the value in-place, use [make_ascii_lowercase
].
To lowercase ASCII characters in addition to non-ASCII characters, use
[str::to_lowercase
].
This method will be deprecated in favor of the identically-named
inherent methods on u8
, char
, [u8]
and str
.
Checks that two values are an ASCII case-insensitive match.
Same as to_ascii_lowercase(a) == to_ascii_lowercase(b)
,
but without allocating and copying temporaries.
This method will be deprecated in favor of the identically-named
inherent methods on u8
, char
, [u8]
and str
.
Converts this type to its ASCII upper case equivalent in-place.
ASCII letters 'a' to 'z' are mapped to 'A' to 'Z',
but non-ASCII letters are unchanged.
To return a new uppercased value without modifying the existing one, use
[to_ascii_uppercase
].
This method will be deprecated in favor of the identically-named
inherent methods on u8
, char
, [u8]
and str
.
Converts this type to its ASCII lower case equivalent in-place.
ASCII letters 'A' to 'Z' are mapped to 'a' to 'z',
but non-ASCII letters are unchanged.
To return a new lowercased value without modifying the existing one, use
[to_ascii_lowercase
].
This method will be deprecated in favor of the identically-named
inherent methods on u8
, char
, [u8]
and str
.
Checks if the value is an ASCII alphabetic character:
U+0041 'A' ... U+005A 'Z' or U+0061 'a' ... U+007A 'z'.
For strings, true if all characters in the string are
ASCII alphabetic.
This method will be deprecated in favor of the identically-named
inherent methods on u8
, char
, [u8]
and str
.
Checks if the value is an ASCII uppercase character:
U+0041 'A' ... U+005A 'Z'.
For strings, true if all characters in the string are
ASCII uppercase.
This method will be deprecated in favor of the identically-named
inherent methods on u8
, char
, [u8]
and str
.
Checks if the value is an ASCII lowercase character:
U+0061 'a' ... U+007A 'z'.
For strings, true if all characters in the string are
ASCII lowercase.
This method will be deprecated in favor of the identically-named
inherent methods on u8
, char
, [u8]
and str
.
Checks if the value is an ASCII alphanumeric character:
U+0041 'A' ... U+005A 'Z', U+0061 'a' ... U+007A 'z', or
U+0030 '0' ... U+0039 '9'.
For strings, true if all characters in the string are
ASCII alphanumeric.
This method will be deprecated in favor of the identically-named
inherent methods on u8
, char
, [u8]
and str
.
Checks if the value is an ASCII decimal digit:
U+0030 '0' ... U+0039 '9'.
For strings, true if all characters in the string are
ASCII digits.
This method will be deprecated in favor of the identically-named
inherent methods on u8
, char
, [u8]
and str
.
Checks if the value is an ASCII hexadecimal digit:
U+0030 '0' ... U+0039 '9', U+0041 'A' ... U+0046 'F', or
U+0061 'a' ... U+0066 'f'.
For strings, true if all characters in the string are
ASCII hex digits.
This method will be deprecated in favor of the identically-named
inherent methods on u8
, char
, [u8]
and str
.
Checks if the value is an ASCII punctuation character:
U+0021 ... U+002F ! " # $ % & ' ( ) * + , - . /
U+003A ... U+0040 : ; < = > ? @
U+005B ... U+0060 [ \\ ] ^ _ `
U+007B ... U+007E { | } ~
For strings, true if all characters in the string are
ASCII punctuation.
This method will be deprecated in favor of the identically-named
inherent methods on u8
, char
, [u8]
and str
.
Checks if the value is an ASCII graphic character:
U+0021 '!' ... U+007E '~'.
For strings, true if all characters in the string are
ASCII graphic characters.
This method will be deprecated in favor of the identically-named
inherent methods on u8
, char
, [u8]
and str
.
Checks if the value is an ASCII whitespace character:
U+0020 SPACE, U+0009 HORIZONTAL TAB, U+000A LINE FEED,
U+000C FORM FEED, or U+000D CARRIAGE RETURN.
For strings, true if all characters in the string are
ASCII whitespace.
Rust uses the WhatWG Infra Standard's definition of ASCII
whitespace. There are several other definitions in
wide use. For instance, the POSIX locale includes
U+000B VERTICAL TAB as well as all the above characters,
but—from the very same specification—the default rule for
"field splitting" in the Bourne shell considers only
SPACE, HORIZONTAL TAB, and LINE FEED as whitespace.
If you are writing a program that will process an existing
file format, check what that format's definition of whitespace is
before using this function.
This method will be deprecated in favor of the identically-named
inherent methods on u8
, char
, [u8]
and str
.
Checks if the value is an ASCII control character:
U+0000 NUL ... U+001F UNIT SEPARATOR, or U+007F DELETE.
Note that most ASCII whitespace characters are control
characters, but SPACE is not.
This method will be deprecated in favor of the identically-named
inherent methods on u8
, char
, [u8]
and str
.