def get_users(mdstring):
    users = []
    for u in re.findall('(^|[^a-zA-Z0-9_!#$%&*@＠\\/]|(^|[^a-zA-Z0-9_+~.-\\/#]))[@＠]([a-z][-\\.a-z\\d]+[a-z\\d])', mdstring):
        users.append(list(u)[(- 1)])
    return users
def get_users(mdstring):
    users = []
    for u in re.findall('(^|[^a-zA-Z0-9_!#$%&*@＠\\/]|(^|[^a-zA-Z0-9_+~.-\\/#]))[@＠]([a-z][-\\.a-z\\d]+[a-z\\d])', mdstring):
        users.append(list(u)[(- 1)])
    return users