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Pattern Matching Functions—Wolfram Language Documentation

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• Functions
  • Cases
  • Count
  • DeleteCases
  • FreeQ
  • Grid
  • MatchQ
  • MemberQ
  • Position
  • ReplaceAll
  • ReplaceAt
  • ReplacePart
  • Set
  • SetDelayed
  • SparseArray
• Related Guides
  • Pattern Language
  • String Patterns
• Tech Notes
  • Finding Expressions That Match a Pattern
  • Testing and Searching List Elements

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

SparseArray  ▪  ReplacePart  ▪  ReplaceAt  ▪  Grid

▪
• Finding Expressions That Match a Pattern
▪
• Testing and Searching List Elements

▪
• Pattern Language
▪
• String Patterns

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