human
I wrote the below code

    def generate_alternatives(string, patterns):
        'Generate    string    alternatives    by    extracting    first    matching    group    for\n                                            each    given    pattern.\n                                '
        alternatives = [string]
        for pattern in patterns:
            match = re.search(pattern, string, re.IGNORECASE)
            if match:
                alternatives.append(match.group(1))
        return alternatives
    (title, artist) = (item.title, item.artist)
    patterns = ['(.*?)    {0}'.format(plugins.feat_tokens())]
    artists = generate_alternatives(artist, patterns)
    patterns = ['(.+?)\\s+[(].*[)]$', '(.*?)    {0}'.format(plugins.feat_tokens(for_artist=False)), '(.+?)\\s*:.*']
    titles = generate_alternatives(title, patterns)
    multi_titles = []
    for title in titles:
        multi_titles.append([title])
        if ('/' in title):
            multi_titles.append([x.strip() for x in title.split('/')])
    return itertools.product(artists, multi_titles)

What's a good function header?
assistant
#Here's a good function header.

def search_pairs(item):