Regular expression for phone numbers [both U.S. an
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]
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