A character set represents a collection of Unicode characters. An instance of NSCharacterSet is a static entity; NSCharacterSet's subclass NSMutableCharacterSet defines an interface to a dynamic set of Unicode characters.

NSCharacterSet is toll-free bridged with the Core Foundation type CFCharacterSet. As such, NSCharacterSet objects can be used interchangeably with the CFCharacterSet pointer type, CFCharacterSetRef.

@interface NSCharacterSet : NSObject <NSCoding, NSCopying, NSMutableCopying>
// Class Methods
+ (NSCharacterSet *)alphanumericCharacterSet;
+ (NSCharacterSet *)capitalizedLetterCharacterSet;
+ (NSCharacterSet *)characterSetWithBitmapRepresentation:(NSData *)data;
+ (NSCharacterSet *)characterSetWithCharactersInString:(NSString *)aString;
+ (NSCharacterSet *)characterSetWithContentsOfFile:(NSString *)fName;
+ (NSCharacterSet *)characterSetWithRange:(NSRange)aRange;
+ (NSCharacterSet *)controlCharacterSet;
+ (NSCharacterSet *)decimalDigitCharacterSet;
+ (NSCharacterSet *)decomposableCharacterSet;
+ (NSCharacterSet *)illegalCharacterSet;
+ (NSCharacterSet *)letterCharacterSet;
+ (NSCharacterSet *)lowercaseLetterCharacterSet;
+ (NSCharacterSet *)nonBaseCharacterSet;
+ (NSCharacterSet *)punctuationCharacterSet;
+ (NSCharacterSet *)uppercaseLetterCharacterSet;
+ (NSCharacterSet *)whitespaceAndNewlineCharacterSet;
+ (NSCharacterSet *)whitespaceCharacterSet;
// Instance Methods
- (NSData *)bitmapRepresentation;
- (BOOL)characterIsMember:(unichar)aCharacter;
- (BOOL)hasMemberInPlane:(uint8_t)thePlane;
- (NSCharacterSet *)invertedSet;
- (BOOL)isSupersetOfSet:(NSCharacterSet *)theOtherSet;
- (BOOL)longCharacterIsMember:(UTF32Char)theLongChar;
// Methods Implementing NSCoding
- (void)encodeWithCoder:(NSCoder *)aCoder;
- (id)initWithCoder:(NSCoder *)aDecoder;
// Methods Implementing NSCopying
- (id)copyWithZone:(NSZone *)zone;
// Methods Implementing NSMutableCopying
- (id)mutableCopyWithZone:(NSZone *)zone;

Subclasses

NSMutableCharacterSet