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External Data Source

Source

Regular Expression
(?:(?:(?:04|06|09|11)\/(?:(?:[012][0-9])|30))|(?:(?:(?:0[135789])|(?:1[02]))\/(?:(?:[012][0-9])|30|31))|(?:02\/(?:[012][0-9])))\/(?:19|20|21)[0-9][0-9]