Rascal/Patterns

Synopsis The various patterns that can be used for pattern matching.

Details Abstract Concrete PatternWithAction Regular

Description The following patterns are available:

Abstract: Abstract patterns.
Concrete: Concrete patterns.
PatternWithAction: A pattern with an associated action that is executed on a successful match.
Regular: Regular expression patterns.

Patterns may be used in:

cases of a Switch or Visit,
on the left of the Match operator (:=),
on the left of the Enumerator operator (<-), and
as formal parameters of Functions.
TryCatch statements to match thrown exceptions.

Each pattern binds variables in a conditional scope. A case statement is such a scope, so are the conditions of if, for, and while and the generators of comprehensions.

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