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External Data Source

Source

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