def tokenize_sentence(text):
    wordPattern = "[A-Za-z]+[']*[A-Za-z]*"  
    wordlist = re.findall( wordPattern, text)
    return wordlist
Returns list of words found in String. Matches A-Za-z and 's
dataset/ETHPy150Open daeilkim/refinery/refinery/refinery/data/models.py/tokenize_sentence