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Simple Query Syntax (default)

Tests a string or list of strings against a query expression similar to an AltaVista "simple query". Elements of the query expression may be regular expressions or literal text, and may be assigned weights.

Example: +sky blue -clouds

Query expressions consist of words (sequences of non-whitespace), regexps or phrases (quoted strings) separated by whitespace. Words or phrases prefixed with a + must be present for the expression to match; words or phrases prefixed with a - must be absent for the expression to match.

Words or phrases may optionally be followed by a number in parentheses (no whitespace is allowed between the word or phrase and the parenthesized number). This number specifies the weight given to the word or phrase; it will be added to the count each time the word or phrase appears in the text.

Example: +sky blue(2) -clouds

If a weight is not given, a weight of 1 is assumed.

From Text-Query-Simple

Advanced Query Syntax

Matches a string or list of strings against a Boolean query expression similar to an AltaVista "advanced query". Elements of the query expression may be regular expressions or literal text.

Example: sky and blue and not (clouds or rain)

Query expressions consist of literal strings (or regexps) joined by the following operators, in order of precedence from lowest to highest:

OR, |
AND, &
NEAR
NOT, !

Operator names are not case-sensitive. Note that if you want to use a | in a regexp, you need to backwhack it to keep it from being seen as a query operator. Sub-expressions may be quoted in single or double quotes to match "and," "or," or "not" literally and may be grouped in parentheses ((, )) to alter the precedence of evaluation.

A parenthesized sub-expression may also be concatenated with other sub- expressions to match sequences: (Perl or Python) interpreter would match either "Perl interpreter" or "Python interpreter". Concatenation has a precedence higher than NOT but lower than AND. Juxtaposition of simple words has the highest precedence of all.

From Text-Query-Advanced

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