import re
stringToParse = "http://p...content-available-to-author-only...k.net/known_by_Anayah.html, we just want Anayah"
print(re.search(r'_([^\W_]+)\.html', stringToParse).group(1))
aW1wb3J0IHJlCnN0cmluZ1RvUGFyc2UgPSAiaHR0cDovL3AuLi5jb250ZW50LWF2YWlsYWJsZS10by1hdXRob3Itb25seS4uLmsubmV0L2tub3duX2J5X0FuYXlhaC5odG1sLCB3ZSBqdXN0IHdhbnQgQW5heWFoIgpwcmludChyZS5zZWFyY2gocidfKFteXFdfXSspXC5odG1sJywgc3RyaW5nVG9QYXJzZSkuZ3JvdXAoMSkp