The real fix was not using absolute paths anymore (so not expanding with the `:p` option). The regex was correct and should at least include the `^` character to make sure the string starts with the given path/filename and not references the path/filename in some error description.
They changed their logic to use related paths instead of absoluut paths (see [here](https://github.com/alecthomas/gometalinter/commit/a04df08be5899be3c7ad69aa379858dcb660c709#diff-04424ed7c660c10495a54e8d11be89eaR253))
This fixes the linter by also using relative paths…