How to extract an IP address from an HTML string?

import re

ipPattern = re.compile('\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}')

findIP = re.findall(ipPattern,s)

findIP contains ['165.91.15.131']

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.

You can use the following regex to capture only valid IP addresses

re.findall(r'\b25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?\.25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?\.25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?\.25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?\b',s)

returns

['165', '91', '15', '131']