Regression: CORS.match_origin regex

[LongLiveCHIEF]

Describe the bug

when configuring the CORS.match_origins in router 1.57, the following was valid regex for the configuration:

match_origins:
  - ^https:\/\/*[.]example[.]com$
  - ^https:\/\/*[.]example[.]org$
  - ^https:\/\/*[.]i?t1.example$
  - ^https:\/\/([a-z0-9-][.])*(?!test)([a-z])?[.]example[.]com$
  - ^https:\/\/([a-z0-9-][.])*([a-z])?[.]example[.]com$

Today I tested deployment of 2.0.0-preview.4 using existing configuration, and received the following error due to this CORS.match_origin configuration:

{"timestamp":"2025-01-20T15:27:49.439586773Z","level":"ERROR","message":"could not create router: CORS configuration error: match origin regex '^https:\\/
/([a-z0-9-][.])*(?!test)([a-z])?[.]example[.]com$' is not valid: regex parse error:
^https:\\/\\/([a-z0-9-][.])*(?!test)([a-z])?[.]preview[.]com$
                             ^^^\nerror: look-around, including look-ahead and look-behind, is not supported","target":"apollo_router::executable","resource":{"service.name":"graph@variant","service.version":"2.0.0-preview.4","process.executable.name":"router"}}
could not create router: CORS configuration error: match origin regex '^https:\/\/([a-z0-9-][.])*(?!test)([a-z])?[.]example[.]com$' is not valid: regex parse error:
^https:\/\/([a-z0-9-][.])*(?!test)([a-z])?[.]example[.]com$
^^^
error: look-around, including look-ahead and look-behind, is not supported

To Reproduce

use a lookaround/lookahead/lookbehind in a CORS.match_origin router config

Expected behavior

This used to be a valid regex string, but preview versions don't allow it.

Output

If applicable, add output to help explain your problem.

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Version [e.g. 22]

Additional context

I was able to take out the erroring part and just create another regex with the strict match to satisfy my conditions, but I wanted to make sure the issue is open in case it exposes an uncovered/needed test case in the testing pipeline.