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External Data Source

Source

Regular Expression
^(\+(1\-)?\d{1,3})?(\s|\-)?(\s|\-)?((\(\d{2}\)|\d{2})(\s|\-)?\d{4}|(\(\d{3}\)|\d{3})(\s|\-)?\d{3})(\s|\-)?\d{4}(\s)?(x|ext|ext.)?(\d{1,6})?,?(\d{1,6})?,?(\d{1,6})?$