Regex pattern can't figure out

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This will work

^\d{4}-\d{3,4}-[23]$

Regex Demo

Regex Breakdown

^ #Start of string
 \d{4} #Match 4 digits
  - #Match - literally
  \d{3,4} #Match 3 or 4 digits
  - #Match - literally
  [23] #Match 2 or 3
$ #End of string

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