+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)$/"
+
+As with phrases, you need to protect the double quotes from the shell
+e.g.
+
+::
+
+ % notmuch search 'folder:"/^.*/(Junk|Spam)$/"'
+