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]}} | ||
Sub substitutes variables in an input string with specified values. | |||
If only template parameters, resource logical IDs and resource attributes are substituted in the String parameter, no variable map is required: | If only template parameters, resource logical IDs and resource attributes are substituted in the String parameter, no variable map is required: | ||
!Sub '${AWS::Region}-something' | !Sub '${AWS::Region}-something' | ||
Revision as of 19:34, 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
Sub substitutes variables in an input string with specified values.
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'