class.ilMailTemplatePlaceholderToEmptyResolver.php

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<?php

declare(strict_types=1);

class ilMailTemplatePlaceholderToEmptyResolver
{
    public function resolve(
        string $message,
    ): string {
        return preg_replace(
            "/({{)(\w+)(}})/",
            '$2',
            $message
        );
    }
}