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  <title>Spam Filter ISP Forums : Last question on regex...promise</title>
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  <description><![CDATA[This is an XML content feed of; Spam Filter ISP Forums : Spam Filter ISP Support : Last question on regex...promise]]></description>
  <pubDate>Fri, 17 Apr 2026 02:31:38 +0000</pubDate>
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   <title><![CDATA[Last question on regex...promise : Understand that I am new to regex...]]></title>
   <link>https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3667&amp;PID=3727&amp;title=last-question-on-regexpromise#3727</link>
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    <![CDATA[<strong>Author:</strong> <a href="https://www.logsat.com/spamfilter/forums/member_profile.asp?PF=38">Terry</a><br /><strong>Subject:</strong> 3667<br /><strong>Posted:</strong> 08 June 2004 at 12:16pm<br /><br /><P>Understand that I am new to regex so this might not be the most elegant solution but I think it is working and since I couldn't use forward or backward features it is the only way I could get it to work...</P><P>First I set the ranges that I won't filter in the list (accounts that are unfiltered)(notice c is not listed in these two expressions)</P><P>^&#091;a-b&#093;</P><P>^&#091;d-z&#093;</P><P>then I pick up any addresses that start with c but are not crosst - a little more complicated</P><P>^c&#091;^r&#093;</P><P>^cr&#091;^o&#093;</P><P>^cro&#091;^s&#093;</P><P>^cros&#091;^s&#093;</P><P>^cross&#091;^t&#093;</P><P>and this seems to work...it only filters the account(s) I want to test and lets all the rest (including the other accounts that start with c)&nbsp;through unfiltered.&nbsp; If you see something wrong with the logic let me know...I also have included other accounts in this ..but haven't quite figured out how I would handle 2 or more accounts that might start with the same character..although for the test I don't need to accomodate this.</P><P>Terry</P><P>ooops...just found out something else...when you don't filter in this manner...then spamfilter lets anything go through...even if it isn't for my domain....this causes a problem as we suddenly look like an open relay to the outside world and they think they are sending emails through us ...so...back to the drawing boards...Terry</P>]]>
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   <pubDate>Tue, 08 Jun 2004 12:16:00 +0000</pubDate>
   <guid isPermaLink="true">https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3667&amp;PID=3727&amp;title=last-question-on-regexpromise#3727</guid>
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   <title><![CDATA[Last question on regex...promise : Great job Terry! If you don&amp;#039;t...]]></title>
   <link>https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3667&amp;PID=3717&amp;title=last-question-on-regexpromise#3717</link>
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    <![CDATA[<strong>Author:</strong> <a href="https://www.logsat.com/spamfilter/forums/member_profile.asp?PF=8">LogSat</a><br /><strong>Subject:</strong> 3667<br /><strong>Posted:</strong> 07 June 2004 at 10:50pm<br /><br /><P>Great job Terry! If you don't mind, I'm very curious to see how you managed to achieve what we failed to find!</P><P>Roberto F.<BR>LogSat Software</P>]]>
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   <pubDate>Mon, 07 Jun 2004 22:50:00 +0000</pubDate>
   <guid isPermaLink="true">https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3667&amp;PID=3717&amp;title=last-question-on-regexpromise#3717</guid>
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   <title><![CDATA[Last question on regex...promise : Hey....I think I actually came...]]></title>
   <link>https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3667&amp;PID=3708&amp;title=last-question-on-regexpromise#3708</link>
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    <![CDATA[<strong>Author:</strong> <a href="https://www.logsat.com/spamfilter/forums/member_profile.asp?PF=2">Guests</a><br /><strong>Subject:</strong> 3667<br /><strong>Posted:</strong> 07 June 2004 at 3:13pm<br /><br /><P>Hey....I think I actually came up with the combinations of regex statements that will do what I need to do for this evaluation...it takes about 20 statements to get 3 people only filtered and everyone else unfiltered but I think it is going to work...</P><P>Terry</P>]]>
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   <pubDate>Mon, 07 Jun 2004 15:13:00 +0000</pubDate>
   <guid isPermaLink="true">https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3667&amp;PID=3708&amp;title=last-question-on-regexpromise#3708</guid>
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   <title><![CDATA[Last question on regex...promise : Thanks Dan. Don&amp;#039;t spend a...]]></title>
   <link>https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3667&amp;PID=3689&amp;title=last-question-on-regexpromise#3689</link>
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    <![CDATA[<strong>Author:</strong> <a href="https://www.logsat.com/spamfilter/forums/member_profile.asp?PF=2">Guests</a><br /><strong>Subject:</strong> 3667<br /><strong>Posted:</strong> 03 June 2004 at 11:50am<br /><br /><P>Thanks Dan.&nbsp; Don't spend a lot of time with this....I can use the tag method if it isn't possible in other ways.</P><P>Terry</P>]]>
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   <pubDate>Thu, 03 Jun 2004 11:50:00 +0000</pubDate>
   <guid isPermaLink="true">https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3667&amp;PID=3689&amp;title=last-question-on-regexpromise#3689</guid>
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   <title><![CDATA[Last question on regex...promise : Terry, Let me think on this....]]></title>
   <link>https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3667&amp;PID=3688&amp;title=last-question-on-regexpromise#3688</link>
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    <![CDATA[<strong>Author:</strong> <a href="https://www.logsat.com/spamfilter/forums/member_profile.asp?PF=22">Desperado</a><br /><strong>Subject:</strong> 3667<br /><strong>Posted:</strong> 03 June 2004 at 8:59am<br /><br /><P>Terry,</P><P>Let me think on this.&nbsp; I will have to come up with a "Cheat" because this ia the reverse of what the filter lists actually do.</P><P>Dan S.</P>]]>
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   <pubDate>Thu, 03 Jun 2004 08:59:00 +0000</pubDate>
   <guid isPermaLink="true">https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3667&amp;PID=3688&amp;title=last-question-on-regexpromise#3688</guid>
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   <title><![CDATA[Last question on regex...promise : I don&amp;#039;t believe I can be...]]></title>
   <link>https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3667&amp;PID=3684&amp;title=last-question-on-regexpromise#3684</link>
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    <![CDATA[<strong>Author:</strong> <a href="https://www.logsat.com/spamfilter/forums/member_profile.asp?PF=2">Guests</a><br /><strong>Subject:</strong> 3667<br /><strong>Posted:</strong> 02 June 2004 at 5:03pm<br /><br /><P>I don't believe I can be unique with less...matter of fact I am sure I can't.&nbsp; These are also all the characters to the left of the @</P><P>Terry</P>]]>
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   <pubDate>Wed, 02 Jun 2004 17:03:00 +0000</pubDate>
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   <title><![CDATA[Last question on regex...promise : Terry, Doubtfull BUT ... are...]]></title>
   <link>https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3667&amp;PID=3680&amp;title=last-question-on-regexpromise#3680</link>
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    <![CDATA[<strong>Author:</strong> <a href="https://www.logsat.com/spamfilter/forums/member_profile.asp?PF=22">Desperado</a><br /><strong>Subject:</strong> 3667<br /><strong>Posted:</strong> 02 June 2004 at 2:33pm<br /><br /><P>Terry,</P><P>Doubtfull BUT ... are these 3 as short as you can get them and still remain unique?&nbsp; And ... It may be easier if the unique part was just to the left of the "@" in the address.</P><P>Regards,</P><P>Dan S.</P>]]>
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   <pubDate>Wed, 02 Jun 2004 14:33:00 +0000</pubDate>
   <guid isPermaLink="true">https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3667&amp;PID=3680&amp;title=last-question-on-regexpromise#3680</guid>
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   <title><![CDATA[Last question on regex...promise : I am trying to do the exact opposite...]]></title>
   <link>https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3667&amp;PID=3679&amp;title=last-question-on-regexpromise#3679</link>
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    <![CDATA[<strong>Author:</strong> <a href="https://www.logsat.com/spamfilter/forums/member_profile.asp?PF=2">Guests</a><br /><strong>Subject:</strong> 3667<br /><strong>Posted:</strong> 02 June 2004 at 2:18pm<br /><br /><P>I am trying to do the exact opposite of the whitelist unfiltered process.&nbsp; This tab appears to be designed to include specific email addresses that will not be filtered.&nbsp; Okay..that will be a list of about a thousand addresses.&nbsp; What I really want to do is filter only a few addresses to evaluate the product in production.&nbsp; These few addresses get lots of spam and would be a great test bed.&nbsp; I realize that I can do this pretty transparently using the header tagging process and write rules for the individual mailboxes in question however this does not test the quarantine process for retrieval which would be valuable item to use.</P><P>So I wrote a regular expression to select every email address except a very few.&nbsp; These few would return negative and thus be filtered while the other 997 would return true and not be filtered.&nbsp; Unfortunately the regex function I used is not supported by spamfilter (look ahead)..so at this time I am out of luck.</P><P>The expression I wrote was</P><P>^(?!crosst|frisit|splaww)</P><P>This represents the first part the email names that I do want to filter...so they should evaluate negatively and all others should be positive (meaning all others bypass the filtering).</P><P>Terry</P>]]>
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   <pubDate>Wed, 02 Jun 2004 14:18:00 +0000</pubDate>
   <guid isPermaLink="true">https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3667&amp;PID=3679&amp;title=last-question-on-regexpromise#3679</guid>
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   <title><![CDATA[Last question on regex...promise : Terry, Can you please detail...]]></title>
   <link>https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3667&amp;PID=3674&amp;title=last-question-on-regexpromise#3674</link>
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    <![CDATA[<strong>Author:</strong> <a href="https://www.logsat.com/spamfilter/forums/member_profile.asp?PF=22">Desperado</a><br /><strong>Subject:</strong> 3667<br /><strong>Posted:</strong> 02 June 2004 at 8:28am<br /><br /><P>Terry,</P><P>Can you please detail EXACTLY what you are trying to do and what list you have your expression in?</P><P>Regards,</P><P>Dan S.</P>]]>
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   <pubDate>Wed, 02 Jun 2004 08:28:00 +0000</pubDate>
   <guid isPermaLink="true">https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3667&amp;PID=3674&amp;title=last-question-on-regexpromise#3674</guid>
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   <title><![CDATA[Last question on regex...promise : Terry, The problem with your...]]></title>
   <link>https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3667&amp;PID=3670&amp;title=last-question-on-regexpromise#3670</link>
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    <![CDATA[<strong>Author:</strong> <a href="https://www.logsat.com/spamfilter/forums/member_profile.asp?PF=8">LogSat</a><br /><strong>Subject:</strong> 3667<br /><strong>Posted:</strong> 29 May 2004 at 4:49pm<br /><br /><P>Terry,</P><P>The problem with your expression not working is that SpamFilter's RegEx&nbsp;engine does not recognize the lookahead and lookbehind extensions, which I think you're using. There are several SpamFilter users who are much more knowledgeable than us in RegEx creations, we'll see if anyone accepts the challenge to come up with such an expression.</P><P>Roberto F.<BR>LogSat Software</P>]]>
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   <pubDate>Sat, 29 May 2004 16:49:00 +0000</pubDate>
   <guid isPermaLink="true">https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3667&amp;PID=3670&amp;title=last-question-on-regexpromise#3670</guid>
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