Catch exception in replaceEnvironmentPath

Catch exception in replaceEnvironmentPath

This exception in the regex constructor is only theoretical (our regex
are hardcoded), but this is creating coverity noise.

Additionally, revert the following commits that are not needed anymore:
6b6fa94c: Catch exceptions to please coverity
c2ed75fd: Fixup 6b6fa94c: coverity says there are more possible exceptions.

This commit is better viewed with 'git show -b'.