Re: quirks with subject searching

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+From: David Bremner <david@tethera.net>\r
+To: matt@bubblegen.co.uk, notmuch@notmuchmail.org\r
+Subject: Re: quirks with subject searching\r
+In-Reply-To: <10f88378b37e653bba961be66183d2d5.squirrel@webmail.plus.net>\r
+References: <10f88378b37e653bba961be66183d2d5.squirrel@webmail.plus.net>\r
+User-Agent: Notmuch/0.19+96~g703c8f9 (http://notmuchmail.org) Emacs/24.4.1\r
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+Date: Tue, 21 Apr 2015 08:47:11 +0900\r
+Message-ID: <87383ufjls.fsf@maritornes.cs.unb.ca>\r
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+\r
+Matthew Lear <matt@bubblegen.co.uk> writes:\r
+>\r
+> item: foo\r
+> an item: foo\r
+> an item: XYfoo1234\r
+> an item: XYfoo bar\r
+>\r
+> ... only the first two are found.\r
+>\r
+> Also:\r
+> * notmuch searching for subject:"item: f" gives zero results.\r
+\r
+notmuch (and xapian) are based on searching for words, not\r
+substrings. It only finds subwords through a process of stemming [1]. \r
+\r
+>\r
+> * notmuch searching for subject:"(*foo*)" results in the first two threads\r
+> being found and also a thread with the word footprint in the middle of the\r
+> subject being found (subject is "memory footprint without feature").\r
+\r
+wildcards [2] are supported only at the end of words, so I suppose the first\r
+* is just ignored.\r
+\r
+>\r
+> Why doesn't notmuch search subject:foo find all four threads, and why\r
+> doesn't notmuch search subject:"item: f" find anything at all?\r
+\r
+Hopefully the above clears it up. This topic comes up fairly often; I'm\r
+not sure if there is something we could add to the  (already rather\r
+long) notmuch-search-terms manpage that would help.\r
+\r
+\r
+[1] "Stemming" in notmuch-search-terms (7)\r
+[2] "Wildcards" in notmuch-search-terms (7)\r