> + private String distribution;
> +
> + public Builder from(String name, String distribution) {
> + this.name = checkNotNull(name, "name cannot be null");
> + this.distribution = checkNotNull(distribution, "distribution cannot
> be null");
> + return this;
> + }
> +
> + public OperatingSystem build() {
> + return new OperatingSystem(distribution, match(VERSION_PATTERN,
> name, 1), match(ARCH_PATTERN, name, 0));
> + }
> + }
> +
> + private static String match(final Pattern pattern, final String input,
> int group) {
> + Matcher m = pattern.matcher(input);
> + return m.find() ? nullToEmpty(m.group(group)) : "";
Or (but up to you)
```
return nullToEmpty(m.find() ? m.group(group) : null);
```
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