Just for fun BOG (Boletín oficial de Gipuzkoa) scraper
Sample url for BOG daily announcements:
https://egoitza.gipuzkoa.eus/gao-bog/castell/bog/2018/12/13/bc181213.htm
Which stands for this pattern (i guess):
https://egoitza.gipuzkoa.eus/gao-bog/castell/bog/aaaa/mm/dd/bcaammdd.htm
aaaa: year in four digit
mm: month in a fixed width two digit number
dd: day in a fixed width two digit number
aammdd: years two last digit plus month two digit fixed width and day two digit fixed width