push notification - APNS or GCM Device Token Validation -


does apns or gcm device tokens have special characters in them? trying server side validation of tokens , need know if should check a-z0-9 , eliminate else?

apns device tokens 32 bytes in binary format. if choose represent them 64 hexadecimal characters, contain hexadecimal characters (0 9 , f).

as gcm registration ids, though google don't give rules regarding possible characters, observed, use 64 characters - z, z, 0 9, '-' , '_'.


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