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Regex sets, ranges, alternations

Theory

Phone number

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You are going to check that the regional part of a phone number of some non-existing country is valid. The requirements are stated as follows:

  1. The regional part consists of 3 symbols.
  2. It should start with a digit, but the digit should not be equal to 7, 8, 9 or 0.
  3. The second symbol should be a digit.
  4. The third symbol should be a part of a hexadecimal notation: that is, it should either be a digit or an uppercase letter in the range from A to F.

Which of the following regular expressions are valid?

Select one or more options from the list
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