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Asked: 2026-05-15T00:47:24+00:00

I want to extract an IP address from a string (actually a one-line HTML)

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I want to extract an IP address from a string (actually a one-line HTML) using Python.

>>> s = "<html><head><title>Current IP Check</title></head><body>Current IP Address: 165.91.15.131</body></html>"

— ‘165.91.15.131’ is what I want!

I tried using regular expressions, but so far I can only get to the first number.

>>> import re
>>> ip = re.findall( r'([0-9]+)(?:\.[0-9]+){3}', s )
>>> ip
['165']

But I don’t have a firm grasp on reg-expression; the above code was found and modified from elsewhere on the web.

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1 Answer

  1. Editorial Team

    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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