Regular expression to match standard 10 digit phone number

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I want to write a regular expression for a standard US type phone number that supports the following formats:

###-###-####
(###) ###-####
### ### ####
###.###.####

where # means any number. So far I came up with the following expressions

^[1-9]\d{2}-\d{3}-\d{4}
^\(\d{3}\)\s\d{3}-\d{4}
^[1-9]\d{2}\s\d{3}\s\d{4}
^[1-9]\d{2}\.\d{3}\.\d{4}

respectively. I am not quite sure if the last one is correct for the dotted check. I also want to know if there is any way I could write a single expression instead of the 4 different ones that cater to the different formats I mentioned. If so, I am not sure how do I do that. And also how do I modify the expression/expressions so that I can also include a condition to support the area code as optional component. Something like

+1 ### ### ####

where +1 is the area code and it is optional.

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