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Mathematica > Parts of Expressions >

Built-in Mathematica Symbol

DeleteCases

DeleteCases[expr, pattern]
removes all elements of expr which match pattern.

DeleteCases[expr, pattern, levelspec]
removes all parts of expr on levels specified by levelspec which match pattern.

DeleteCases[expr, pattern, levelspec, n]
removes the first n parts of expr which 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 -1 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: