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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def is_email(string):
 """ True False True """

    email_regex = r'^[A-Za-z0-9\.\+_-]+@[A-Za-z0-9\._-]+\.[a-zA-Z]*$'

    if isinstance(string, str) and not re.match(email_regex, string):
        return False
    else:
        return True