import pyperclip, re

phoneRegex = re.compile(r'''(
(\d{3}|\(\d{3}\))?  # area code
(\s|-|\.)?          # separator
(\d{3})             # first 3 digits
(\s|-|\.)           # separator
(\d{4})             # last 4 digits
(\s*(ext|x|ext.)\s*(\d{2,5}))?      # extension
)''', re.VERBOSE)