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AWS::Lambda::EventSourceMapping Filter
      A structure within a FilterCriteria object that defines an event filtering pattern.
    
Syntax
To declare this entity in your Amazon CloudFormation template, use the following syntax:
JSON
{ "Pattern" :String}
YAML
Pattern:String
Properties
Pattern- 
                    
A filter pattern. For more information on the syntax of a filter pattern, see Filter rule syntax.
Required: No
Type: String
Pattern:
.*Minimum:
0Maximum:
4096Update requires: No interruption