> + 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);
> + }
> + }
> +
> + if (version == null) {
> + logger.warn("could not find the operating system version for image:
> %s", name);
> + }
> +
> + return version;
Is version allowed to be `null`? `WellKnownImage.Builder` does not list it as
`@Nullable`?
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