Cases
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.
Example: Cases[
2, x, 4
, _Integer]
 .
The first argument to Cases need not have head List.
Cases[
expr
,
pattern
,
levspec
,
n
] gives the first n parts in expr which match the pattern.
Level specifications are described in Section A.3.6.
See The Mathematica Book on the web:Section 2.3.2.
See also: Select, Position, Collect.
Further Examples
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