Text filter Rules

A text filter (wherever it appears in the program) is a text string using logical operators: AND, OR, NOT, NEAR (or their synonyms) and ordered by parentheses: ().

Space, tab stop and linefeed are accepted as substring delimiters within a filter. To include a space, or any other special character, begin and end with angle brackets: < >.

Valid operators for a text filter, in order of priority, are:

Operator	Synonyms	Description
NEAR	* ^	Proximity. Expresses two words near each other within the text. Use NEAR when you wish to find word collocation from two words by a standing number. For example, this filter: ( tubes * gas ) will search for those entries which contain both substrings <tubes> and <gas> at a distance of no more than 30 characters apart.
NOT		Negation. An example: (NOT tubes) - will eliminate all results which contain the substring <tubes>.
AND NOT	!	Cut. This operator defines a subcategory of results which is excluded. For example, this filter: ( tubes !gas !stainl) will locate entries containing <tubes>, yet exclude any which also contain <gas> or <stainless steel>. This operator works in the same manner as combining AND and NOT.
AND	+ &	Conjunction. This binary operator filters an expression which contains both of the elements on each side of the operator. An example: (sales + tubes). This will return entries containing both words, excluding entries which contain only the single word <tubes>, giving a result showing only those tubes which are for sale.
OR	<Space>	This binary operator will return entries which contain either of the elements entered on each side of the operator. The OR operator is binary, yet can be multi-layered. For example the following identical filters: ( mp3 OR wav OR midi OR mod ), (mp3 wav midi mod) will find those entries which mention only one of the listed sound files.

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