Re: [notmuch] strange behavior of indexing of and searching for strings containing...

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+From: Olly Betts <olly@survex.com>\r
+Date: Fri, 5 Feb 2010 23:48:03 +0000 (UTC)\r
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+Subject: Re: [notmuch] strange behavior of indexing of and searching for\r
+ strings containing '[]'\r
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+\r
+On 2010-02-05, Jameson Rollins wrote:\r
+> Hey, folks.  I've been noticing some strange behavior of notmuch search\r
+> results for strings containing '[]'.  Here are some searches for some\r
+> exact strings in messages subjects:\r
+\r
+The '[]' is a red herring.  Xapian's TermGenerator and QueryParser classes\r
+treat these two characters pretty much as if they were spaces.\r
+\r
+> servo:~ 0$ notmuch search subject:'emacs paned UI'\r
+\r
+Note that the '' is quoting for the shell only here.  So Xapian sees:\r
+\r
+    subject:emacs paned UI\r
+\r
+Assuming you are defaulting to an AND search, that's `emacs in the subject'\r
+AND `paned anywhere in the indexed text' AND `UI anywhere in the indexed text'.\r
+\r
+To specify a quoted phrase you want "" anyway (not ''), so the command\r
+matching what I think you intended to search for is:\r
+\r
+    notmuch search 'subject:"emacs paned UI"'\r
+ \r
+> servo:~ 0$ notmuch search subject:'[notmuch] emacs paned UI'\r
+\r
+    notmuch search 'subject:"[notmuch] emacs paned UI"'\r
+\r
+Which should return identical results to:\r
+\r
+    notmuch search 'subject:"notmuch emacs paned UI"'\r
+\r
+> thread:5f2cb4b108773a39161b33c86e54f7fd  4 mins. ago [1/1] Jameson Rollins;=\r
+>  [notmuch] loss of duplicate messages (inbox)\r
+> servo:~ 0$=20\r
+>\r
+> Not only did it not turn up the message that *does* match that exact\r
+> string in it's subject line, it actually turns up a completely different\r
+> message that doesn't match the search term at all!\r
+\r
+It matches the notmuch in the subject, and presumably emacs, paned, and UI\r
+in the body.\r
+\r
+> [snip the rest - the same explanations apply]\r
+\r
+Cheers,\r
+    Olly\r
+\r