Detecting Asian characters in a string

With the simple use of a regular expression to find out if a string contains Chinese, Japanese or Korean (aka CJK) characters.

	#import <Foundation/Foundation.h>


	@interface NSString (CJK)

	/**
	Detect if the string contains Chinese, Japanese or Korean characters

	@return YES if the string contains CJK characters, NO otherwise
	*/
	– (BOOL)containsAsianCharacters;

	@end

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NSString+CJK.h

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	#import "NSString+CJK.h"


	@implementation NSString (CJK)

	– (BOOL)containsAsianCharacters
	{
	if (![self length])
	return NO;

	NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"[\u2E80-\u9FFF]" options:NSRegularExpressionCaseInsensitive error:nil];
	return ([regex matchesInString:self options:0 range:NSMakeRange(0, [self length])]);
	}

	@end

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NSString+CJK.m

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Cyril Chandelier