def t_IDENTIFIER(token):

    r'(?:[a-z]+_*[A-Z]*)+|(?:[A-Z]+_*[a-z]*)+'
    
    return token

63e32aab2d6fc1d843214aac5cc57bb28d602d00
<mask token>

def t_IDENTIFIER(token):
    """(?:[a-z]+_*[A-Z]*)+|(?:[A-Z]+_*[a-z]*)+"""
    return token

def t_IDENTIFIER(token):

    r'(?:[a-z]+_*[A-Z]*)+|(?:[A-Z]+_*[a-z]*)+'
    
    return token
