regex - How can I make a regular expression for IP address with Subnetmask? - Stack Overflow
Python regular expressions for IPv4 and IPv6 addresses and URI-references, based on RFC 3986's ABNF.The URI-reference regular expression includes IPv6 address zone ID support (RFC 6874). · GitHub
An introduction to regular expressions – O'Reilly
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9 Regular Expressions You Should Know
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networking - How to extract IP address from the log's string with regular expression and Notepad++ - Super User
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Check if a string is a valid IP address or not in Python using regular expression
