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External Data Source

Source

Regular Expression
^(\d|\d{1,9}|1\d{1,9}|20\d{8}|21[0-3]\d{7}|214[0-6]\d{6}|2147[0-3]\d{5}|21474[0-7]\d{4}|214748[0-2]\d{3}|2147483[0-5]\d{2}|21474836[0-3][0-9]|214748364[0-7])$