Add anchors to name regex

[michaeljguarino]

apparently validate_format doesn't default to whole-string matches, regex anchors solve for that

Test Plan

unit

Checklist

• If required, I have updated the Plural documentation accordingly.
• I have added tests to cover my changes.
• I have added a meaningful title and summary to convey the impact of this PR to a user.
• I have added relevant labels to this PR to help with categorization for release notes.

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