Regular expression for phone numbers [both U.S. and International]

Question

If no + then assume U.S. format and store xxx-xxx-xxxx as the default format.
Allow (xxx) xxx-xxxx or xxx-xxx-xxxx or xxx.xxx.xxxx or (xxx) xxx xxxx or xxx xxx xxxx

If +sign then assume International phone and store as +xx-xx-xxx-xxx (Country + AreaCode + Phone)

Allow
+[2]-[2-4]-[3-4]-[3-4]  i.e +[2igits]-[2 to 4 digits]-[3 to 4 digits]-[3 to 4 digits]
+[2] [2-4] [3-4] [3-4]  i.e.+[2igits] [2 to 4 digits] [3 to 4 digits] [3 to 4 digits]