AWS CloudFormation Concepts Intrinsic Functions: Difference between revisions
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{{External|[https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/intrinsic-function-reference-sub.html Sub]}} | {{External|[https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/intrinsic-function-reference-sub.html Sub]}} | ||
If only template parameters, resource logical IDs and resource attributes are substituted in the String parameter, no variable map is required: | |||
!Sub '${AWS::Region}-something' | |||
Revision as of 19:33, 13 March 2019
External
Internal
Ref
The intrinsic function Ref returns the value of the specified parameter or resource. When a parameter logical name is specified, it returns the value of the parameter. When a resource logical name is specified, it returns a value that can be typically used to refer to that resource, such as a physical ID.
Join
!Join [ delimiter, [ comma-delimited list of values ] ]
!Join ['-', [ a, b, c ]]
returns "a:b:c"
Split
!Split ['.', "www.example.com"]
returns ["www", "example", "com"].
Select
Sub
If only template parameters, resource logical IDs and resource attributes are substituted in the String parameter, no variable map is required:
!Sub '${AWS::Region}-something'