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# AWS::Lex::Bot SlotValueRegexFilter
<a name="aws-properties-lex-bot-slotvalueregexfilter"></a>

Provides a regular expression used to validate the value of a slot.

## Syntax
<a name="aws-properties-lex-bot-slotvalueregexfilter-syntax"></a>

To declare this entity in your Amazon CloudFormation template, use the following syntax:

### JSON
<a name="aws-properties-lex-bot-slotvalueregexfilter-syntax.json"></a>

```
{
  "[Pattern](#cfn-lex-bot-slotvalueregexfilter-pattern)" : String
}
```

### YAML
<a name="aws-properties-lex-bot-slotvalueregexfilter-syntax.yaml"></a>

```
  [Pattern](#cfn-lex-bot-slotvalueregexfilter-pattern): String
```

## Properties
<a name="aws-properties-lex-bot-slotvalueregexfilter-properties"></a>

`Pattern`  <a name="cfn-lex-bot-slotvalueregexfilter-pattern"></a>
A regular expression used to validate the value of a slot.  
 Use a standard regular expression. Amazon Lex supports the following characters in the regular expression:   
+ A-Z, a-z
+ 0-9
+ Unicode characters ("\$1⁠u<Unicode>")
 Represent Unicode characters with four digits, for example "\$1⁠u0041" or "\$1⁠u005A".   
 The following regular expression operators are not supported:   
+ Infinite repeaters: \$1, \$1, or \$1x,\$1 with no upper bound.
+ Wild card (.)
*Required*: Yes  
*Type*: String  
*Minimum*: `1`  
*Maximum*: `300`  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)