Cannot get 'ignore-url' working

[ryma2fhir]

Summary

I have the following that I want ignored:

URL `resource.html#identifiers'
Name `discussion'
Parent URL https://simplifier.net/guide/uk-core-implementation-guide-stu2/Home/ProfilesandExtensions/Profile-UKCore-AllergyIntolerance?version=2.0.0-pre-release, line 530, col 123
Real URL https://simplifier.net/guide/uk-core-implementation-guide-stu2/home/profilesandextensions/resource.html?version=2.0.1-pre-release#identifiers
Check time 3.592 seconds
Info Redirected to
`https://simplifier.net/guide/uk-core-implementation-guide-stu2/home/profilesandextensions/resource.html?version=2.0.1-pre-release#identifiers'
status: 302 Found.
Result Error: 404 Not Found

so I have tried adding the following to ignore in the linkcheckerrc & --ignore-url:
r"^(?!.*http).*html.*$"

This should ignore any url that does not contain 'http' but does contain 'html'. This has been tested with re.search and works as expected, i,e. it finds the expression.

Actual result

url is still checked

Expected result

url is ignored

Environment

• Operating system: ubuntu-latest (github action)
• Linkchecker version: 10.4.0
• Python version: 3.10
• Install method: PyPI

Configuration

      linkchecker -r 2 --check-extern --no-status --ignore-url=[@] --ignore-url=r"^(?!.*http).*html.*$" -f
      ./IGPageContentValidator/linkcheckerrc https://simplifier.net/guide/uk-core-implementation-guide-stu2/home/terminology/allvaluesets?version=2.0.1-pre-release

##################### filtering options ##########################
[filtering]
ignore=
  \.png
  [@]
  r"^(?!.*http).*html.*$"

https://github.com/NHSDigital/IOPS-FHIR-Test-Scripts/blob/update/linkChecker/IGPageContentValidator/linkcheckerrc