Find cases that explicitly match integers:

Find cases that do not match integers:

Return the x from inside each f[x_] matched:

Use the operator form of Cases:

Pick elements from an Association:

Find all cases of lists of two elements:

Find the sum of every pair of elements:

Pick out elements that are not 0:

Pick out cases of integers down to level 2:

Return only the first three matching elements:

Use :> to evaluate only after explicit elements have been found:

Find all possible subexpressions at any level:

Find all possible subexpressions at any level, including the head of the expression:

Pick elements from nested associations:

Pick elements from a List matching an Association:

Find keys of each matching Association:

Pick pairs of keys from each association in a list:

Find associations with the key satisfying a condition:

Count returns the length of the result given by Cases:

Compute Cases in parallel:

A rule transforms the matching elements into its right side:

Use HoldPattern to treat the rule itself as a pattern: