import re

def remove_html_tags(text):
    """Remove HTML tags from text"""
    clean = re.compile('<.*?>')
    return re.sub(clean, '', text)

def remove_url(text):
    """Remove URLs from text"""
    return re.sub(r'http\S+|www.\S+', '', text)

def remove_digits(text):
    """Remove digits from text"""
    return re.sub(r'\d+', '', text)

def remove_punc(text):
    """Remove punctuation from text"""
    return re.sub(r'[^\w\s]', '', text)

def lower(text):
    return str.lower(text)