[SQU] Problems with an url_regex acl (possible bug)

dear squid users i've one question...
I'm using squid 2.4pre stable (today snapshot)
i've made a simple acl (i write the squid.conf section)

acl porn url_regex "/usr/local/squid/etc/blocked/porn.txt"
...
...
...
http_access deny porn
http_access allow all
....

------------------------------------------------------------

now the problem is:
the acl works perfectly but in some strange case i've returned "access denied" also when the url is not in the "porn.txt" I can't realize why.
I attach the file porn.txt
and I report an Url with I have this problems
http://194.243.134.51/newscom.nsf/main/AF215666D2C930CCC1256A00003FCED8?

Is this a Java script problem ?
Is this a potentially bug ?
Or i'm a simple lamer that can't write url_regex acl ?
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