Hello,

  I have some troubles with regex negative lookahead. When searching 
in 
all directories but one (say inbox), I do the following query:

 > notmuch search folder:"/^(?!inbox)/"

and I receive the following error:

     notmuch search: A Xapian exception occurred
     A Xapian exception occurred parsing query: Regexp error: Invalid 
preceding regular expression
     Query string was: folder:"/^(?!inbox)/"

Bests,

Erwan.



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