mkdocs-pages/docs/examples/regexmatch.md

#Regex examples

##Match an IP address \d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}

If we use this expression on the following using grep to search the file

grep -oP '\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}' log.txt'

103.252.153.201
127.0.0.1 - - [30/Dec/2018 22:43:01] "GET / HTTP/1.0" 200 -
210.49.93.254, 66.102.6.169
127.0.0.1 - - [31/Dec/2018 09:17:47] "GET / HTTP/1.0" 200 -
210.49.93.254, 66.102.6.173
127.0.0.1 - - [31/Dec/2018 09:17:48] "GET /favicon.ico HTTP/1.0" 200 -
112.140.176.2
127.0.0.1 - - [01/Jan/2019 01:58:43] "GET / HTTP/1.0" 200 -
112.140.176.2
127.0.0.1 - - [01/Jan/2019 01:58:45] "GET /favicon.ico HTTP/1.0" 200 -
112.140.176.2
127.0.0.1 - - [01/Jan/2019 01:58:51] "POST / HTTP/1.0" 200 -
112.140.176.2
127.0.0.1 - - [01/Jan/2019 01:58:51] "GET /favicon.ico HTTP/1.0" 200 -
112.140.176.2
127.0.0.1 - - [01/Jan/2019 02:13:07] "GET /EviXDWpXvH HTTP/1.0" 200 -
210.49.93.254, 66.102.6.171
127.0.0.1 - - [02/Jan/2019 10:32:17] "GET / HTTP/1.0" 200 -
210.49.93.254, 66.102.6.173
127.0.0.1 - - [02/Jan/2019 10:32:18] "GET /favicon.ico HTTP/1.0" 200 -

The output will be a list of IP addresses in the file that looks like

103.252.153.201
127.0.0.1
210.49.93.254
66.102.6.169
127.0.0.1
210.49.93.254
66.102.6.173
127.0.0.1
112.140.176.2
127.0.0.1
112.140.176.2
127.0.0.1
112.140.176.2
127.0.0.1
112.140.176.2
127.0.0.1
112.140.176.2
127.0.0.1
210.49.93.254
66.102.6.171
127.0.0.1
210.49.93.254
66.102.6.173
127.0.0.1