Validate if input string is a number between 0-255 using regex

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Tested this:

static String pattern = "^(([0-1]?[0-9]?[0-9]?|2[0-4][0-9]|25[0-5])\\.){3}([0-1]?[0-9]?[0-9]?|2[0-4][0-9]|25[0-5]){1}$";

It works for the following:

  • IP Addresses xxx.xxx.xxx.xxx / xx.xx.xx.xx / x.x.x.x / mix of these.
  • Leading zeros are allowed.
  • Range 0-255 / maximum 3 digts.

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