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External Data Source

Source

Regular Expression
^(1|1(\s|\s?-\s?|\s?\.\s?|\s?/\s?))?((\(?[2-9]{1}[\d]{2}\)?(\s|\s?-\s?|\s?\.\s?|\s?/\s?)?))?(\d{3})(\s|\s?-\s?|\s?\.\s?|\s?/\s?)?(\d{4})$