Regex Isn't Working in TOC Macro

Summary

Regex function is not working in TOC macro anymore.

Steps to Reproduce

1. Add a sample page in your Confluence instance with some headings, e.g. in this case we'd add some headings that starts with characters from A-E.
2. Include a Table of Contents macro in this page and specify some regex in the Include Headings option, for example:
   {code}[a-c,A-B].*{code}

Expected Results

Confluence only list down headings that starts with either A, B or C in the TOC macro

Actual Results

Confluence list down all of the available headings in that page.