Pattern matching makes possible some of the most succinct and elegant programs in the Wolfram Language—immediately compressing large numbers of conditional cases into simple, readable and efficient pattern specifications.

Cases — a list of elements matching a pattern

Position — positions of elements matching a pattern

Count — a count of occurrences of a pattern

ReplaceAll (/.) — replace all occurrences of a pattern

DeleteCases — delete all occurrences of a pattern

Set (=), SetDelayed (:=) — define transformations for patterns

MemberQ — test if any member of a list matches a pattern

FreeQ — test if an expression is free of a pattern

MatchQ — test whether an expression matches a pattern

Patterns for Part Specifications

SparseArray  ▪  ReplacePart  ▪  ReplaceAt  ▪  Grid