How to extract an IP address from an HTML string?

by

Remove your capturing group:

ip = re.findall( r'[0-9]+(?:\.[0-9]+){3}', s )

Result:

['165.91.15.131']

Notes:

  • If you are parsing HTML it might be a good idea to look at BeautifulSoup.
  • Your regular expression matches some invalid IP addresses such as 0.00.999.9999. This isn’t necessarily a problem, but you should be aware of it and possibly handle this situation. You could change the + to {1,3} for a partial fix without making the regular expression overly complex.

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