> +   }
> +
> +   private String extractOsVersion(OsFamily family, String name) {
> +      String version = null;
> +      if (family == OsFamily.WINDOWS) {
> +         // TODO: Find a way to restrict better the windows version
> +         Matcher matcher = WINDOWS_VERSION_PATTERN.matcher(name);
> +         if (matcher.matches()) {
> +            version = matcher.group(1);
> +         }
> +      } else {
> +         Matcher matcher = UNIX_VERSION_PATTERN.matcher(name);
> +         if (matcher.matches()) {
> +            version = matcher.group(1);
> +         }
> +      }

I initially had an inline if, but as the windows pattern has nothing to be with 
the unix one, I preferred to have an explicit if. Otherwise it seems that both 
patterns *must* use the "group 1" for the version, when that's just a 
coincidence. I can change it back if you think it is more readable, though.

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