fix(cloudwatch): update regex expression that prevents CloudWatch:Mah:UnknownIdentifier warnings (#33591)

[garciparedes]

Issue # (if applicable)

Closes #33591

Reason for this change

• The validation is causing false-positive warning messages when using partial identifiers on CloudWatch Metric expressions supporting them.

Description of changes

• Update the condition to generate the warning message in order to prevent false-positives when one of the special keywords is used.

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

[aws-cdk-automation]

(This review is outdated)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.21%. Comparing base (a21190e) to head (1d11712).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #33592   +/-   ##
=======================================
  Coverage   82.21%   82.21%           
=======================================
  Files         119      119           
  Lines        6876     6876           
  Branches     1162     1162           
=======================================
  Hits         5653     5653           
  Misses       1120     1120           
  Partials      103      103           

Flag	Coverage Δ
suite.unit	82.21% <ø> (ø)

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Components	Coverage Δ
packages/aws-cdk	∅ <ø> (∅)
packages/aws-cdk-lib/core	82.21% <ø> (ø)

[garciparedes]

Exemption Request: the pull request is updating a warning message so there is nothing to cover on integration tests.

[GavinZZ]

LGTM, thank you!

✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[mergify]

This pull request has been removed from the queue for the following reason: checks failed.

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[garciparedes]

@Mergifyio requeue

[mergify]

requeue

❌ Command disallowed due to command restrictions in the Mergify configuration.

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Pull request has been modified.

[garciparedes]

Hey @GavinZZ, seems like the initial automated merge request failed for some reason. I updated the PR with the latest change. Could you try it again?

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[mergify]

This pull request has been removed from the queue for the following reason: pull request branch update failed.

The pull request can't be updated

You should look at the reason for the failure and decide if the pull request needs to be fixed or if you want to requeue it.

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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[GavinZZ]

@Mergifyio requeue

[mergify]

requeue

✅ The queue state of this pull request has been cleaned. It can be re-embarked automatically

[mergify]

This pull request has been removed from the queue for the following reason: pull request branch update failed.

The pull request can't be updated

You should look at the reason for the failure and decide if the pull request needs to be fixed or if you want to requeue it.

If you want to requeue this pull request, you need to post a comment with the text: @mergifyio requeue

Pull request has been modified.

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[github-actions]

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[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 1d11712
• Result: SUCCEEDED
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