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import re
s = input('Email address: ')
# match looks from start string, doesn't require consuming all
# search looks in the middle
match = re.match('([a-zA-Z][a-zA-Z0-9_.]*)@([a-zA-Z0-9][a-zA-Z0-9._]*[a-zA-Z0-9])', s)
if match:
    print('Match!')
    print(match.groups())
else:
    print('Not valid')
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX