Pensieve header: Undated: Patterns.

Patterns

?Blank

?Pattern

?BlankSequence

?BlankNullSequence

?Alternatives

?Repeated

?RepeatedNull

?Except

?Longest

?Shortest

?Condition

?PatternTest

?Optional

?Default

Information[#, LongForm->False]& /@ {OptionsPattern, PatternSequence, Verbatim, HoldPattern, OrderlessPatternSequence, KeyValuePattern};