It depends on how old you are and how long you've had your Roth. If this is a Designated Roth 401(k) through your job then any employer match will be taxable. IRS doesn't allow employer matches to be deposited into a Designated Roth 401(k). They are in a pre-tax 401(k), meaning contributions and earnings will be taxed on withdrawal.
Contact your bank. They can probably tell you whether your withdrawal would be taxable.
As for your contribution, Investopedia has a good explanation at What Are the Roth 401(k) Withdrawal Rules?
