- (NSUInteger)analyseRX:(NSString *)string withPatternString:(NSString *)patternString
{
    //     \\[[^\\]]+\\]  用以匹配字符串中所出現的 [*] 的個數
    //     <[^>]+>        用以匹配字符串中所出現的 <*> 的個數

    if (string == nil)
    {
        return 0;
    }

    // 正則表達式
    NSRegularExpression *regex = \
        [NSRegularExpression regularExpressionWithPattern:patternString
                                                  options:NSRegularExpressionCaseInsensitive
                                                    error:nil];
    // 執行相關匹配操作
    NSRange range = NSMakeRange(0, [string length]);
    NSUInteger numberOfMatches = [regex numberOfMatchesInString:string
                                                        options:0
                                                          range:range];

    // 返回匹配的個數
    return numberOfMatches;
}