The previous code used regular expressions in the form of ^(?P<path>[^:]+):... to match the path in the linter output. A regexp like that doesn't work on Windows though, where paths are in the C:\foo\bar.go format. I thus changed all regexp strings to use the pattern from predefinedPatterns, which seems to work well enough. Due to this the "metalinter" ignored the output of half of all invoked linters.

I also applied some other minor changes to the regexps in general to make them more uniform.