Procmail regex group reuse

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+Date: Wed, 13 Mar 2013 16:16:30 +0100\r
+From: Guyzmo <guyzmo+notmuch@m0g.net>\r
+To: Notmuch <notmuch@notmuchmail.org>\r
+Subject: Procmail regex group reuse\r
+Message-ID: <20130313151630.GE14028@vilya.m0g.net>\r
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+\r
+Hello,\r
+\r
+    I have looked over that usage pattern over the procmail doc and\r
+mailing lists for some time now, and it seems no one ever asked the\r
+question:\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. Something like the\r
+following:\r
+\r
+--------8<----------------8<----------------8<---------------8<--------\r
+:0:notmuch.lock\r
+* .*foo\+\(\w+\)@mydomain\.tld.*\r
+{ \r
+    TAGS="${TAGS} $1"\r
+}\r
+-------->8---------------->8---------------->8--------------->8--------\r
+\r
+    where "$1" would be the group match (like `\1` in sed). I used \r
+to do it easily when I was using sup, and I really miss it now that I\r
+have switched to notmuch.\r
+\r
+    Maybe I shall use another mail matching program like formail, or \r
+shall I write a patch for it, but I'd like first to ask here if someone \r
+had the same issue, and found a solution.\r
+\r
+-- \r
+Guyzmo\r