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External Data Source

Source

Regular Expression
^(?:(?<1>[(])?(?<AreaCode>[2-9]\d{2})(?(1)[)][ ]?|[- \/.]?))? (?<Prefix>[1-9]\d{2})[- .]?(?<Suffix>\d{4}) (?:(?:[ ]+|[xX]|Ext\.?[ ]?){1,2}(?<Ext>\d{1,5}))?$