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# AWS::DataBrew::Dataset FilterExpression
<a name="aws-properties-databrew-dataset-filterexpression"></a>

Represents a structure for defining parameter conditions.

## Syntax
<a name="aws-properties-databrew-dataset-filterexpression-syntax"></a>

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

### JSON
<a name="aws-properties-databrew-dataset-filterexpression-syntax.json"></a>

```
{
  "[Expression](#cfn-databrew-dataset-filterexpression-expression)" : {{String}},
  "[ValuesMap](#cfn-databrew-dataset-filterexpression-valuesmap)" : {{[ FilterValue, ... ]}}
}
```

### YAML
<a name="aws-properties-databrew-dataset-filterexpression-syntax.yaml"></a>

```
  [Expression](#cfn-databrew-dataset-filterexpression-expression): {{String}}
  [ValuesMap](#cfn-databrew-dataset-filterexpression-valuesmap): {{
    - FilterValue}}
```

## Properties
<a name="aws-properties-databrew-dataset-filterexpression-properties"></a>

`Expression`  <a name="cfn-databrew-dataset-filterexpression-expression"></a>
The expression which includes condition names followed by substitution variables, possibly grouped and combined with other conditions. For example, "(starts\_with :prefix1 or starts\_with :prefix2) and (ends\_with :suffix1 or ends\_with :suffix2)". Substitution variables should start with ':' symbol.  
*Required*: Yes  
*Type*: String  
*Pattern*: `^[><0-9A-Za-z_.,:)(!= ]+$`  
*Minimum*: `4`  
*Maximum*: `1024`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`ValuesMap`  <a name="cfn-databrew-dataset-filterexpression-valuesmap"></a>
The map of substitution variable names to their values used in this filter expression.  
*Required*: Yes  
*Type*: Array of [FilterValue](aws-properties-databrew-dataset-filtervalue.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)