BUILT-IN MATHEMATICA SYMBOL

# Longest

Longest[p]
is a pattern object that matches the longest sequence consistent with the pattern p.

## DetailsDetails

• Longest works for both ordinary expression patterns and string patterns.
• If several Longest objects occur in the same expression, those that appear first are given higher priority to match longest sequences.
• Longest[p, pri] is given priority pri to be the longest sequence. Matches for longest sequences are tried first for Longest objects with higher priorities.
• Priorities can be any expression, and are ordered in standard Mathematica Sort order. Longest[p] specifies the highest possible priority.
• Longest objects with equal priorities are tried in the order they appear in the expression.
• If no explicit Longest or Shortest is given, ordinary expression patterns are normally effectively assumed to be Shortest[p], while string patterns are assumed to be Longest[p].
• For ordinary expressions, Longest[p] specifies that not just p itself, but also all parts of p should match the longest sequences.

## ExamplesExamplesopen allclose all

### Basic Examples (1)Basic Examples (1)

Require that matches the longest sequence it can:

 Out[1]=

The default is to have earlier patterns match shortest sequences:

 Out[2]=

## TutorialsTutorials

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