Re: correct way to search for only PDF attachments

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+ Mon, 28 Sep 2015 19:00:14 -0700 (PDT)\r
+From: Carl Worth <cworth@cworth.org>\r
+To: Xu Wang <xuwang762@gmail.com>, notmuch@notmuchmail.org\r
+Subject: Re: correct way to search for only PDF attachments\r
+In-Reply-To:\r
+ <CAJhTkNgwX8cmsKfJGV+x7HHMXPNZvXFXO=KZzLvrcWCGrDL=Pg@mail.gmail.com>\r
+References:\r
+ <CAJhTkNgwX8cmsKfJGV+x7HHMXPNZvXFXO=KZzLvrcWCGrDL=Pg@mail.gmail.com>\r
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+Date: Mon, 28 Sep 2015 19:00:13 -0700\r
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+--=-=-=\r
+Content-Type: text/plain\r
+\r
+On Mon, Sep 28 2015, Xu Wang wrote:\r
+> I would look to look for all emails from a colleague jongho. I tried:\r
+>\r
+> from:jongho attachment:pdf\r
+>\r
+> which seems to do as I wanted.\r
+\r
+Good. That should work.\r
+\r
+> To understand more, what does the following search for?\r
+>\r
+> from:jongho attachment:.*pdf\r
+\r
+Uhm, probably only strange things. There are some mechanisms for getting\r
+notmuch to emit some debugging information on what the final search\r
+terms end up being, (but I don't recall if they still require\r
+recompilation or not).\r
+\r
+I'm not testing now, but I wouldn't be surprised if that ended up doing\r
+something like searching for a phrase like "attachment pdf" anywhere\r
+within a message. (The Xapian parser can be somewhat unpredictable when\r
+you give it unexpected input.)\r
+\r
+> Also, how does the first one above know that I want only PDF\r
+> attachments and not an attachment called "pdformula.txt" ?\r
+\r
+It doesn't know that you want only PDF attachments. The key part is that\r
+the indexing is performed by breaking text up into individual terms, (at\r
+punctuation boundaries usually). So a search specification like\r
+"attachment:pdf" is searching for things that were indexed with the\r
+"pdf" term within the attachment prefix. So that won't match a filename\r
+like pdformula.txt, (which would be indexed as two terms, "pdformula"\r
+and "txt"), but it would match pdf.ormula.txt, (which would be indexed\r
+as three terms, "pdf", "ormula" and "txt").\r
+\r
+The Xapian documentation can be examined if you want more details.\r
+\r
+-Carl\r
+\r
+--=-=-=\r
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