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Jun 4, 2019
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Update active pattern syntax representation #12628

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12 changes: 9 additions & 3 deletions docs/fsharp/language-reference/active-patterns.md
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Expand Up @@ -10,10 +10,16 @@ ms.date: 05/16/2016
## Syntax

```fsharp
// Complete active pattern definition.
let (|identifer1|identifier2|...|) [ arguments ] = expression
// Active pattern of one choice.
let (|identifier|) [arguments] valueToMatch= expression

// Active Pattern with multiple choices.
// Uses a FSharp.Core.Choice<_,...,_> based on the number of case names. In F#, the limitation n <= 7 applies.
let (|identifer1|identifier2|...|) valueToMatch = expression

// Partial active pattern definition.
let (|identifier|_|) [ arguments ] = expression
// Uses a FSharp.Core.option<_> to represent if the type is satisfied at the call site.
let (|identifier|_|) [arguments ] valueToMatch = expression
```

## Remarks
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