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Cases

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Cases[list, pattern]

returns the elements of list that match pattern.

Cases[list, pattern, ls]

returns the elements matching at levelspec ls.

Cases[list, pattern, Heads->bool]

Match including the head of the expression in the search.

• • Cases[{a, 1, 2.5, "string"}, _Integer|_Real]

• • Cases[_Complex][{1, 2I, 3, 4-I, 5}]

Find symbols among the elements of an expression:

• • Cases[{b, 6, \[Pi]}, _Symbol]

Also include the head of the expression in the previous search:

• • Cases[{b, 6, \[Pi]}, _Symbol, Heads -> True]