Search for	Example	Results
A single word	`cat`	Topics that contain the word "cat". You will also find its grammatical variations, such as "cats".
A phrase. You can specify that the search results contain a specific phrase.	`"cat food"` (quotation marks)	Topics that contain the literal phrase "cat food" and all its grammatical variations. Without the quotation marks, the query is equivalent to specifying an OR operator, which finds topics with one of the individual words instead of the phrase.

Search for	Operator	Example
Two or more words in the same topic	`AND` `and` `+` (plus symbol) `&` (ampersand)	`cat AND dog` `"cat food"+milk` `"cat food"&"dog food"`
Either word in a topic	`OR` `or` `\|` (pipe)	`cat OR dog` `cat \| dog`
Topics that do not contain a specific word or phrase	`NOT` `not` `!` (exclamation point)	`NOT cat` `! dog`
Topics that contain one string and do not contain another	`^` (caret)	`cat ^ mouse`
A combination of search types	`( )` parentheses	`cat + (dog \| mouse)` `cat \| dog + (! mouse)`

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Develop > Programming Guide > System language > Data types > Data type: Compound > Logical operators

Logical operators

A logical operator evaluates one or two Boolean expressions. It determines whether the expression is true, false, or unknown.

The logical operators are as follows (executed in the order shown):

The unknown truth value is treated according to the Substitution Principle, which dictates:

If UNKNOWN occurs as a logical operand, then the result of the operation is TRUE if substituting TRUE or FALSE for UNKNOWN always yields TRUE.
The result is FALSE if substituting TRUE or FALSE for UNKNOWN always yields FALSE.
The result is UNKNOWN if substituting TRUE or FALSE for UNKNOWN sometimes yields TRUE and sometimes yields FALSE.