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External Data Source

Source

Regular Expression
^(([1-9][0-9]{0,3}|[1-4][0-9]{4}|5([0-8][0-9]{3}|9([0-2][0-9]{2}|3([0-8][0-9]|9[01]))))|(6(4(5(1[2-9]|[2-9][0-9])|[6-9][0-9]{2})|5([0-4][0-9]{2}|5([0-2][0-9]|3[0-4]))))|(1(3(1(0(7[2-9]|[89][0-9])|[1-9][0-9]{2})|[2-9][0-9]{3})|[4-9][0-9]{4})|[2-9][0-9]{5}|[1-9][0-9]{6,8}|[1-3][0-9]{9}|4([01][0-9]{8}|2([0-8][0-9]{7}|9([0-3][0-9]{6}|4([0-8][0-9]{5}|9([0-5][0-9]{4}|6([0-6][0-9]{3}|7([01][0-9]{2}|2([0-8][0-9]|9[0-4]))))))))))$