Write Rule Snort alert TCP

[nguyen cao via Snort-users <snort-users () lists snort org>]

I use wireshark to capture packets and detect tcp packets with no content
at all. I use the rule:
alert tcp any any -> no any (msg: "test"; pcre: "/ (% 20) /"; sid: 1000001;
rev: 1; Help me solve the problem

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