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External Data Source

Source

Regular Expression
^((\(([1-9]{2})\))(\s)?(\.)?(\-)?([0-9]{0,1})?([0-9]{4})(\s)?(\.)?(\-)?([0-9]{4})|(([1-9]{2}))(\s)?(\.)?(\-)?([0-9]{0,1})?([0-9]{4})(\s)?(\.)?(\-)?([0-9]{4}))$