A regular expression delimited with // that will be matched
against the path of the file or directory relative to the database
path. Matching files and directories will be ignored. The
- beginning and end of string must be explictly anchored. For
+ beginning and end of string must be explicitly anchored. For
example, /.*/foo$/ would match "bar/foo" and "bar/baz/foo", but
not "foo" or "bar/foobar".
Default: ``auto``.
+**index.header.<prefix>** **[STORED IN DATABASE]**
+ Define the query prefix <prefix>, based on a mail header. For
+ example ``index.header.List=List-Id`` will add a probabilistic
+ prefix ``List:`` that searches the ``List-Id`` field. User
+ defined prefixes must not start with 'a'...'z'; in particular
+ adding a prefix with same name as a predefined prefix is not
+ supported. See **notmuch-search-terms(7)** for a list of existing
+ prefixes, and an explanation of probabilistic prefixes.
+
**built_with.<name>**
Compile time feature <name>. Current possibilities include
"compact" (see **notmuch-compact(1)**) and "field_processor" (see