import re


def clean_str(text):
    """
    Tokenization/string cleaning for dataset
    Every dataset is lower cased except
    """
    # if string:

    text = re.sub(r"\\", " ", text)    
    text = re.sub(r"\'", " ", text)    
    text = re.sub(r"\"", " ", text)    
    return text.strip().lower()