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doc: add more information on operators.

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More material borrowed from the wiki page on "searching"
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David Bremner 2015-01-18 13:59:31 +01:00
parent 7fa58b792c
commit 4313be0a0c
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50
doc/man7/notmuch-search-terms.rst
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@ -124,16 +124,48 @@ The time range can also be specified using timestamps with a syntax of:
Each timestamp is a number representing the number of seconds since
1970-01-01 00:00:00 UTC.
In addition to individual terms, multiple terms can be combined with
Boolean operators ( **and**, **or**, **not** , etc.). Each term in the
query will be implicitly connected by a logical AND if no explicit
operator is provided, (except that terms with a common prefix will be
implicitly combined with OR until we get Xapian defect #402 fixed).
Operators
---------
In addition to individual terms, multiple terms can be combined with
Boolean operators (**and**, **or**, **not**, and **xor**). Each term
in the query will be implicitly connected by a logical AND if no
explicit operator is provided (except that terms with a common prefix
will be implicitly combined with OR). The shorthand '-<term>' can be
used for 'not <term>' but unfortunately this does not work at the
start of an expression. Parentheses can also be used to control the
combination of the Boolean operators, but will have to be protected
from interpretation by the shell, (such as by putting quotation marks
around any parenthesized expression).
In addition to the standard boolean operators, Xapian provides several
operators specific to text searching.
::
notmuch search term1 NEAR term2
will return results where term1 is within 10 words of term2. The
threshold can be set like this:
::
notmuch search term1 NEAR/2 term2
The search
::
notmuch search term1 ADJ term2
will return results where term1 is within 10 words of term2, but in the
same order as in the query. The threshold can be set the same as with
NEAR:
::
notmuch search term1 ADJ/7 term2
Parentheses can also be used to control the combination of the Boolean
operators, but will have to be protected from interpretation by the
shell, (such as by putting quotation marks around any parenthesized
expression).
Stemming
--------