Fix anchor escaping in call to Regexp.new

[myabc]

What are you trying to accomplish?

• Fix broken Generate static files workflow on main due to a regression introduced in Don't instantiate or use Regexp when string.start_with? will do #3177 (308a56b).
• Fix running bundle exec rake utilities:build static:dump

Integration

Not AFAICT.

List the issues that this change affects.

Closes #3263

Risk Assessment

• Low risk the change is small, highly observable, and easily rolled back.
• Medium risk changes that are isolated, reduced in scope or could impact few users. The change will not impact library availability.
• High risk changes are those that could impact customers and SLOs, low or no test coverage, low observability, or slow to rollback.

What approach did you choose and why?

Fixes classname keys when generating lib/primer/classify/utilities.yml with bundle exec rake utilities:build.

Anything you want to highlight for special attention from reviewers?

Accessibility

• Fixes axe scan violation - This change fixes an existing axe scan violation.
• No new axe scan violation - This change does not introduce any new axe scan violations.
• New axe violation - This change introduces a new axe scan violation. Please describe why the violation cannot be resolved below.

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Lookbook)
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge

Take a look at the What we look for in reviews section of the contributing guidelines for more information on how we review PRs.

[changeset-bot]

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Latest commit: 6720dd9

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[joshblack]

Thanks so much for this!

[camertron]

Nice, this makes sense to me. Thanks! 🎉

[camertron]

Ah wait, apologies. Could you add a changeset? Just run npx changeset and folllow the prompts. I'd do it myself but I don't have push access to your branch 😅

[myabc]

@camertron there should already be a changeset - I added it after the fact (see 661e0fe)