fix(stepfunctions): allow multiline jsonata strings

[MathieuGilbert]

Issue #35912

Closes #35912.

Reason for this change

The inability to use multiline JSONata expressions in certain places, for example:

Condition.jsonata(`{%
  false
%}`)

Description of changes

• Add the "dotAll" flag to the private jsonata helper testing whether a string is wrapped in the Step Functions JSONata expression tags. The "s" flag allows the dot to match across newlines, enabling the use of well-formatted complex expressions.
  • Also considered String.startsWith and String.endsWith, but opted for the minimal change to preserve the existing regex which is also likely more performant.
• Include unit tests for both helper functions in jsonata.ts.
• Reuse isValidJsonataExpression where the same regex expression was used in condition.ts and task-utils.ts.

Describe any new or updated permissions being added

N/A

Description of how you validated changes

• Unit tests were added including the multiline cases.
• Existing integration test for Step Functions with JSONata was updated to have its Condition use a multi-line string.
• A construct overriding Condition to use this regex for validation was successfully used in a local project to get around the current single-line limitation.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

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  • fix(stepfunctions): allow multiline jsonata strings #35985
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  • fix(stepfunctions): allow multiline jsonata strings #35985
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