Mathematica > Core Language > Rules & Patterns > Patterns > PatternTest (?)
BUILT-IN MATHEMATICA SYMBOL

PatternTest


is a pattern object that stands for any expression which matches p, and on which the application of test gives True.

DetailsDetails

  • Any result for other than True is taken to signify failure.
  • The operator has a high precedence. Thus is , not .
  • In a form such as __?test every element in the sequence matched by must yield True when test is applied.

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Basic Examples (1)Basic Examples (1)

Find cases of any expression which satisfies the NumberQ test:

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