Regex Redirect Unsual redirects

[mmtadam]

Hi,

I'm seeing some odd redirect using the regex redirect in the optimizely CMS, they passed me over here.

When I navigate to
/careers/search?searchTerm=early) careers professionals &default=false&filterOption=exact&countryFilters=[{"filterName":"Country","filterValue":"Singapore"}]

The regex is set to redirect to /careers/explore-our-careers/?take=12

However what I end up getting is
/en/careerssearch/?searchTerm=early%20careers%20professionals%20&default=false&filterOption=exact&countryFilters=[%7B%22filterName%22:%22Country%22,%22filterValue%22:%22Singapore%22%7D]

I tried with another url without the params in case that was the issue
/careers/test
and it became /en/careerstest
so what it seems to be doing is just removing the slash and adding en in front and I'm not sure why.
The 2 regexs are
(https://)(.)({domain}.com/careers/search)(.)
(https://)(.*)({domain}.com/careers/)(.+)

Any advice would be greatly appreciated