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import re

pattern = r'http://myblog.com/posts/(\S*)/comments/(\d*)'
regex_object = re.compile(pattern)

URL = 'http://myblog.com/posts/john-travolta/comments/5'
match = regex_object.match(URL)

if match:
  param1, param2 = match.groups()
  print(param1)
  # john-travolta
  print(param2)
  # 5