Rule regex backreferences not working

[yolabingo]

Problem Statement

Rules using regex are matched but the regex-matched string is not being substituted in the Rule action.

Steps to Reproduce

Set Rules using regex with Rule Actions that reference the matched regex string

Current Behavior

curl -s --head https://demo.dotcms.com/blog/ | grep -i regex
regex-current-url: $1
regex-host: $1

Expected Behavior

curl -s --head https://demo.dotcms.com/blog/ | grep -i regex
regex-current-url: https://demo.dotcms.com/blog/ # or whatever it matches, not sure exactly
regex-host: demo.dotcms.com

Acceptance Criteria

Rule regex backreferences working as expected

dotCMS Version

all

Proposed Objective

Core Features

Proposed Priority

Priority 2 - Important