def extractURL(s):
    listURL = []
    L = s.split()
    for element in L:
        if (element.startswith('https://') or element.startswith('http://')):
            listURL.append(element)
    return listURL
s = "como entrar site https://www.sapo.pt ou isto será um site https://www.jn.pt"
print(extractURL(s))