Python - get URLs from CSS

urls_from_css.py

def get_urls(css_file):
    """
    Get all URLs from a CSS file with regex pattern matching.
    
    URI's, like data URIs are ignored and URLs might be relative.
    
    :param css_file: a string representing the CSS file (use open()
     and read() or a request library to get the string)
    :return: list with retrived urls
    """
    import re
    
    urls = re.findall(r'url\(["\']?(?P<url>[^"\'\)].*?)["\']?[\)]', css_file)
    return urls