CODEWITHSUNDEEP
regexamazon-web-servicesaws-cloudformation
John Bernal
John Bernal

Reputation: 250

CloudFormation Parameter Dynamic Regex

I have a a CloudFormation template with 2 parameters. I want to set an AllowedPattern value for the 2nd parameter such that its regex is dynamically generated based on the value for the first parameter. Something like this:

CloudFormation Parameters

WebsiteDomain:
  Type: String
EmailAddress:
  Type: String
  AllowedPattern: !Sub '.*@${WebsiteDomain}'

Allowed Input

WebsiteDomain: google.com
EmailAddress: [email protected]

Disallowed Input

WebsiteDomain: google.com
EmailAddress: [email protected]

Is there any way to accomplish this?

Upvotes: 2

Views: 590

Answers (3)

stijndepestel
stijndepestel

Reputation: 3544

Cloudformation templates are not so dynamic, but you could write a script using the AWS CDK which would allow you to write logic to check this yourself and then either immediately deploy it to the AWS environment or synthesize a CloudFormation template from the defined resources in your CDK app.

Upvotes: 3

Marcin
Marcin

Reputation: 238199

You would have to use CloudFormation macro for pre-processing of your template, before actuall deployment. Ohterwise, you can't do what you wan't.

Upvotes: 3

Gandalf
Gandalf

Reputation: 9855

Unfortunately, No. CF Templates are not that dynamic.

Upvotes: 1

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