分析一下spinrtf函数这段代码的匹配含义

$pattern = sprintf('/(?:,\s*|^)\%Qs\E(?=,\s*|$)/m', $this->input->ip_address());

        // Returns 1, 0 or FALSE (on error only). Therefore implicitly convert 1 to TRUE
        if (preg_match($pattern, $this->config->item('rest_ip_blacklist')))

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就是匹配黑名单中的IP