Checkstyle package regex is wrong

[StrongestNumber9]

Describe the bug

<property name="format" value="^com\.teragrep\.[a-z]{3}_\d{2}(?:.[a-zA-Z]\w*)*$"></property>

The last group should have escaped dot

<property name="format" value="^com\.teragrep\.[a-z]{3}_\d{2}(?:\.[a-zA-Z]\w*)*$"></property>

Expected behavior

Should not cause any issues as . is rarely anything except actual dot but it could be

How to reproduce

Screenshots

Software version

Desktop (please complete the following information if relevant):

• OS:
• Browser:
• Version:

Additional context