Python Regex to find whitespace, end of string, and/or word boundary

Question

I am using re in python 2.7.5 for regex. I am trying to have it match foobar.com/1, `foobar.com/12, foobar.com/123, or

Answer 1

foobar\.com/\d{1,4}\b

Will do the trick.

Answer 2

... or you could use the negative lookahead (?!...) to make sure there is not a fifth digit.

>>> re.findall(r'foobar[.]com/\d{1,4}(?!\d)', comment.body)
['foobar.com/1319', 'foobar.com/567', 'foobar.com/1302', 'foobar.com/201']