如何在Linux Shell中使用正则表达式从文件中提取IP地址？

https://www.itranslater.com/qa/details/2326268539734328320

https://blog.haostudio.net/hwp/shell-tips-ipv4-address-%E5%88%A4%E6%96%B7

IPv4正则表达式匹配

https://blog.csdn.net/weixin_30381317/article/details/95775449

https://blog.csdn.net/u012806692/article/details/50635590

https://blog.csdn.net/u012942818/article/details/48382085

https://www.cnblogs.com/olive987/p/5844501.html

How do I write a regular expression that matches an IPv4 dotted address?

https://devblogs.microsoft.com/oldnewthing/20060522-08/?p=31113

关于正则表达式：正则表达式匹配DNS主机名或IP地址？

https://www.codenong.com/106179

Validating IPv4 addresses with regexp

https://stackoverflow.com/questions/5284147/validating-ipv4-addresses-with-regexp

RegEx: Find IP Addresses in a File Using Grep

https://www.shellhacks.com/regex-find-ip-addresses-file-grep/

Regular expression in Bash to validate IP-address

https://unix.stackexchange.com/questions/111841/regular-expression-in-bash-to-validate-ip-address

What regular expression can I use to match an IP address?

https://superuser.com/questions/202818/what-regular-expression-can-i-use-to-match-an-ip-address

How to select and print IP address from a set of strings?

https://askubuntu.com/questions/552221/how-to-select-and-print-ip-address-from-a-set-of-strings

How to Find or Validate an IP Address

https://www.regular-expressions.info/ip.html

How To Use Regular Expression – Regex In Bash Linux?

https://www.poftut.com/how-to-use-regular-expression-regex-in-bash-linux