正则表达式匹配中文

/**
 *  正则表达式匹配中文
 */
- (BOOL)isRegexMatching:(NSString *)str;
{
    NSString *regex = @"^[u4E00-u9FFF]+$";
    return [[NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex] evaluateWithObject:str];
}