[PATCH] doc: add a section on quoting to notmuch-search-terms(7)

[David Bremner]

I think we've diverged enough from the Xapian query parser
that we can't rely on that syntax description [1]. As far as I can
tell, [1] also only discusses quotes in the context of phrases.

[1]: https://xapian.org/docs/queryparser.html
---
 doc/man7/notmuch-search-terms.rst | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/doc/man7/notmuch-search-terms.rst b/doc/man7/notmuch-search-terms.rst
index b4d784a3..a4e5abfc 100644
--- a/doc/man7/notmuch-search-terms.rst
+++ b/doc/man7/notmuch-search-terms.rst
@@ -273,6 +273,28 @@ Both of these will match a subject "Free Delicious Pizza" while
 
 will not.
 
+Quoting
+-------
+
+Double quotes are also used by the notmuch query parser to protect
+boolean terms or regular expressions containing spaces or other
+special characters, e.g.
+
+::
+
+   tag:"a tag"
+
+::
+
+   folder:"/^.*/(Junk|Spam)$/"
+
+As with phrases, you will probably have to protect the double quotes
+from the shell e.g.
+
+::
+
+   % notmuch search 'folder:"/^.*/(Junk|Spam)$/"'
+
 DATE AND TIME SEARCH
 ====================
 
-- 
2.16.3