setApi example

return (new ChangelogDefinition())
            ->setTitle($this->parseMetadata($content, 'title') ?: '')
            ->setIssue($this->parseMetadata($content, 'issue') ?: '')
            ->setFlag($this->parseMetadata($content, 'flag'))
            ->setAuthor($this->parseMetadata($content, 'author'))
            ->setAuthorEmail($this->parseMetadata($content, 'author_email'))
            ->setAuthorGitHub($this->parseMetadata($content, 'author_github'))
            ->setCore($this->parseSection($content, ChangelogSection::core->value))
            ->setAdministration($this->parseSection($content, ChangelogSection::administration->value))
            ->setStorefront($this->parseSection($content, ChangelogSection::storefront->value))
            ->setApi($this->parseSection($content, ChangelogSection::api->value))
            ->setUpgradeInformation($this->parseSection($content, ChangelogSection::upgrade->value))
            ->setNextMajorVersionChanges($this->parseSection($content, ChangelogSection::major->value));
    }

    /** * Retrieve the metadata of changelog */
    private function parseMetadata(string $content, string $meta): ?string
    {
        preg_match('/^' . $meta . '\s*:([^\n]+)$/im', $content, $matches);