So if I wanted multiple ISP's in the same rule can I do an OR operator or can I just create multiple header rules with the same lable?
All rules must have different names.. if two rules have the same name, the first is over-written.
There is a regex OR operator, but I'd really advise just doing separate rules for now. The OR operation in regex's is a bit tricky.
Example:
priv-edtnes56.telusplanet.net priv-edtnes57.telusplanet.net misav02.sasknet.sk.ca
header LOCAL_RCVD_TRUSTED_SMTP Received =~ /priv-?\.telusplanet\.net|?\.sasknet\.sk\.ca/i score LOCAL_RCVD_TRUSTED_SMTP -10.0
or
header LOCAL_RCVD_TRUSTED_SMTP Received =~ /?\.sasknet\.sk\.ca/i header LOCAL_RCVD_TRUSTED_SMTP Received =~ /priv-?\.telusplanet\.net/i score LOCAL_RCVD_TRUSTED_SMTP -10.0
So the `.` is required before all pattern matches such as {0-20} and is the `?` the wildcard operator?
No, . is the wildcard character. ? isn't a wildcard at all.
The {0,20} is actually a repeat-count limit.
.{0,20} means "match as few as 0 or as many as 20 wildcard characters"
z{1,20} would match a string of at least 1, and as many as 20 z's
? is also a repeat count limit.. It is the same as {0,1}
so
.? means "match any character, 0 or 1 times". It's used to do things like planes? which will match "plane" or "planes".
? is also used inside OR operations to prevent backtracing, so (?: x| y) is an or operation, matching x or y with no regex backtracing.. it's kind of messy.
Is there a FAQ on the format for writing rules? Are these just regex? It's about time to buy a book on this.
They are perl regex, an extension of plain regex and I've got a howto on rule writing. It also has a list of links in it to pages on regex syntax.
http://mywebpages.comcast.net/mkettler/sa/SA-rules-howto.txt
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