static [TValueOrError](API\Runtime\Core\Math\TValueOrError)< [FNumericUnit](API\Runtime\Core\Math\FNumericUnit)< NumericType >, [FText](API\Runtime\Core\Internationalization\FText) > TryParseExpression ( const TCHAR * InExpression, EUnit InDefaultUnit, const [FNumericUnit](API\Runtime\Core\Math\FNumericUnit)< NumericType > & InExistingValue )