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regex_integer_in_range = r"^[1-1][0-9][0-9][0-9][0-9][0-9]$|^[2-9][0-9][0-9][0-9][0-9][0-9]$" regex_alternating_repetitive_digit_pair = r"(\d)(?=\d\1)"
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Validating Postal Codes
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