Cases
 Usage
• Cases[{ ,  , ... }, pattern] gives a list of the  that match the pattern.
• Cases[{ , ... }, pattern -> rhs] gives a list of the values of rhs corresponding to the  that match the pattern.
• Cases[expr, pattern, levspec] gives a list of all parts of expr on levels specified by levspec which match the pattern.
• Cases[expr, pattern -> rhs, levspec] gives the values of rhs which match the pattern.
• Cases[expr, pattern, levspec, n] gives the first n parts in expr which match the pattern.
Notes
• The first argument to Cases need not have head List. • Cases[expr, pattern :> rhs] evaluates rhs only when the pattern is found. • Level specifications are described in Section A.3.6. • New in Version 1.
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