Unexpected search results

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+Return-Path: <paul.melis@surfsara.nl>\r
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+       Mon, 27 Jan 2014 11:10:13 +0100\r
+Message-ID: <52E63086.1050001@surfsara.nl>\r
+Date: Mon, 27 Jan 2014 11:10:14 +0100\r
+From: Paul Melis <paul.melis@surfsara.nl>\r
+Organization: SURFsara\r
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+To: <notmuch@notmuchmail.org>\r
+Subject: Unexpected search results\r
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+\r
+Hi,\r
+\r
+How exactly does the search function work when it comes to things like \r
+searching in the from or subject field? See the below queries and (lack \r
+of) results:\r
+\r
+paulmlocal@sara11006:/data$ notmuch search from:dem\r
+paulmlocal@sara11006:/data$ notmuch search from:demi\r
+paulmlocal@sara11006:/data$ notmuch search from:demiu\r
+paulmlocal@sara11006:/data$ notmuch search from:demiur\r
+paulmlocal@sara11006:/data$ notmuch search from:demiurg\r
+thread:0000000000012d53   January 18 [1/5] Demiurg HG| Paul Melis, XXXXX\r
+thread:0000000000011b82  November 14 [3/6] Demiurg HG| Paul Melis; XXXXX\r
+\r
+Only the last queries returns the mails I was looking for, while \r
+prefixes of the query don't return anything. Even stranger is that the \r
+actual from e-mail address is demiurghg@...., so why does "from:demiurg" \r
+match (which is also a prefix of the mail address), but all the other \r
+don't match?\r
+\r
+Thanks for a great tool, btw!\r
+\r
+Regards,\r
+Paul\r
+\r
+\r
+-- \r
+** SURFsara heeft een nieuw algemeen telefoonnummer: 020 800 1300 **\r
+\r
+Paul Melis\r
+| Groepsleider & Adviseur Visualisatie | SURFsara |\r
+| Science Park 140 | 1098 XG Amsterdam |\r
+| T 020 592 30 59 | paul.melis@surfsara.nl | www.surfsara.nl |\r