Content checking in Snort-2.8.3.2

[bahamin takhtaei <b_takhtaei () yahoo com>]

Hi,
I install Snort-2.8.3.2 and check some content-rules, but Snort can't match any content
with "content-length > 2" !
for example:

I add these rules to local.rules:
1. alert tcp any any -> any any (sid:10001001; msg:"http-th"; content:"th"; nocase;)
2. alert tcp any any -> any any (sid:10001002; msg:"http-the"; content:"the"; nocase;)
3. alert tcp any any -> any any (sid:10001003; msg:"http-hex"; content: "|20 61 6e 64 20 64 69 72|"; nocase;)
4. alert tcp any any -> any any (sid:10001004; msg:"http-hex2"; content:"|20 61|"; nocase;)
-----------------------------------------------------------------------

then send a http-traffic to Snort-machine that contains many "the" pattern, but only rule1 and rule4 are triggerd. Why 
please?

Notice: my snort.conf is a sample config file that there is on snort.org.



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