# AllowedExtension
<a name="API_AllowedExtension"></a>

Information about an allowed file extension.

## Contents
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 ** Extension **   <a name="connect-Type-AllowedExtension-Extension"></a>
The file extension. The extension must be between 1 and 10 characters and can contain only alphanumeric characters, hyphens, and underscores.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 10.  
Pattern: `^[a-zA-Z0-9-_]+$`   
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/connect-2017-08-08/AllowedExtension) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/connect-2017-08-08/AllowedExtension) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/connect-2017-08-08/AllowedExtension)