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Mathematica > Core Language > Expressions > Parts of Expressions > DeleteCases >

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DeleteCases

removes all elements of expr that match pattern.

removes all parts of expr on levels specified by levelspec that match pattern.

removes the first n parts of expr that match pattern.

With the option Heads->True, you can delete heads with DeleteCases. Deleting the head of a particular element in an expression is equivalent to applying FlattenAt to the expression at that point.

Level consists of numbers, symbols, and other objects that do not have subparts.

DeleteCases traverses the parts of expr in a depth-first order, with leaves visited before roots.

Delete cases that match integers:

Out[1]=

Deleting the head

effectively flattens: