So here’s a little RegEx I’ve whipped up that will match all of the following phone number notation styles:
^[\+]?[\d]{0,3}[\-|\s]?[\(]?[\d]{3}[\)|\-]?[\s|\d]?[\d]{2,3}[\-]?[\d]{3,4}$
EDIT: Fellow Google Pluser Bradley Moore took a crack at my expression above and cleaned it up a bit. Here’s the update:
^\+?\d{0,3}[ -]?\(?\d{3}\)?[ -]*\d{3}[ -]*\d{4}$ 555-555-5555 555 555-5555 5555555555 15555555555 +15555555555 1-555-555-5555 +1-555-555-5555 +12 555-555-5555 +1 (555) 555-5555 (555) 555-5555