Re: Procmail regex group reuse

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+From: Istvan Marko <notmuch@kismala.com>\r
+To: Guyzmo <guyzmo+notmuch@m0g.net>, Notmuch <notmuch@notmuchmail.org>\r
+Subject: Re: Procmail regex group reuse\r
+In-Reply-To: <20130313151630.GE14028@vilya.m0g.net>\r
+References: <20130313151630.GE14028@vilya.m0g.net>\r
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+Date: Wed, 13 Mar 2013 12:16:29 -0700\r
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+\r
+Guyzmo <guyzmo+notmuch@m0g.net> writes:\r
+\r
+>     Would it be possible to reuse a part of the match regexp in procmail\r
+> so it can be reused in the action part of the rule. \r
+\r
+procmail has a limited way of extracting subexpressions:\r
+\r
+       MATCH This variable is assigned to by procmail whenever it is\r
+             told to extract text from a matching regular expression.\r
+             It will contain all text matching the regular expression\r
+             past the `\/' token.\r
+\r
+So you get everything between \/ to the end of the whole regexp. In your\r
+case this will get hairy because you need to match stuff after the part\r
+you want to extract. The ?? construct might help to further trim it\r
+down, maybe something like:\r
+\r
+* ^TO\/foo\+[a-z]+@mydomain\.tld\r
+* MATCH ?? ^foo\+\/[a-z]+\r
+{\r
+  TAG=$MATCH\r
+}\r
+\r
+Or if you are willing to switch to maildrop it has pcre and proper\r
+submatches.\r
+\r
+Are you tagging with notmuch-deliver?\r
+\r
+-- \r
+       Istvan\r