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Firebase prototype identifier: what characters can be inside?

For the application I am creating, I want to use the identifier generated by Firebase push as the local part of the email address. Since dash(-) is not allowed as the first character, I would like to replace it with another character.

However, this should be reversible. So I want to know what characters the push Firebase identifier is with? So far I have seen:

  • alpha (az and AZ and 0-9)
  • underline (_)
  • dash (-)

Example: -KD3rcGMuucRDjKOTK3O

  • Are there any other characters that may be contained in the ID?
  • Do firebase identifiers always start with a dash?
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, , push- Firebase, . , , Firebase push, : 2 ^ 120 . , push-, /.

, , , 8 push- , , , .

JavaScript- push.

, Firebase, :

-0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz;

, - - , , push- ( ) -. - 0, 1 .. , , .

: , timestamp push. , : Firebase?

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