# FilterExpression
<a name="API_FilterExpression"></a>

Represents a structure for defining parameter conditions. Supported conditions are described here: [Supported conditions for dynamic datasets](https://docs.aws.amazon.com/databrew/latest/dg/datasets.multiple-files.html#conditions.for.dynamic.datasets) in the * AWS Glue DataBrew Developer Guide*.

## Contents
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**Note**  
In the following list, the required parameters are described first.

 ** Expression **   <a name="databrew-Type-FilterExpression-Expression"></a>
The expression which includes condition names followed by substitution variables, possibly grouped and combined with other conditions. For example, "(starts\$1with :prefix1 or starts\$1with :prefix2) and (ends\$1with :suffix1 or ends\$1with :suffix2)". Substitution variables should start with ':' symbol.  
Type: String  
Length Constraints: Minimum length of 4. Maximum length of 1024.  
Pattern: `^[<>0-9A-Za-z_.,:)(!= ]+$`   
Required: Yes

 ** ValuesMap **   <a name="databrew-Type-FilterExpression-ValuesMap"></a>
The map of substitution variable names to their values used in this filter expression.  
Type: String to string map  
Key Length Constraints: Minimum length of 2. Maximum length of 128.  
Key Pattern: `^:[A-Za-z0-9_]+$`   
Value Length Constraints: Maximum length of 1024.  
Required: Yes

## See Also
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For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/databrew-2017-07-25/FilterExpression) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/databrew-2017-07-25/FilterExpression) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/databrew-2017-07-25/FilterExpression)