import re
text = 'http://s...content-available-to-author-only...s.com/contact-us/'
m = re.search('(https?:\/\/[^:\/\n]+)', text)
if m:
print(m.group(1))
aW1wb3J0IHJlCgp0ZXh0ID0gJ2h0dHA6Ly9zLi4uY29udGVudC1hdmFpbGFibGUtdG8tYXV0aG9yLW9ubHkuLi5zLmNvbS9jb250YWN0LXVzLycKCm0gPSByZS5zZWFyY2goJyhodHRwcz86XC9cL1teOlwvXG5dKyknLCB0ZXh0KQppZiBtOgogICAgcHJpbnQobS5ncm91cCgxKSk=