^
(?:
    (?:
        [\+]?
        (?<CountryCode>
            [\d]{1,3}
            (?:
                [ ]+
                |
                [\-.]
            )
        )
    )?
    [(]?
    (?<AreaCode>
        [\d]{3}
    )
    [\-/)]?
    (?:[ ]+)?
)?
(?<Number>
    [a-zA-Z2-9][a-zA-Z0-9 \-.]{6,}
)
(?:
    (?:
        [ ]+
        |
        [xX]
        |
        (i:ext[\.]?)
    ){1,2}
    (?<Ext>
        [\d]{1,5}
    )
)?
$