Added many more pages
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#Grep examples
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#Regex examples
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##Match an IP address
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`\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}`
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If we use this expression on the following using grep to search the file
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`grep -oP '\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}' log.txt'`
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```
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103.252.153.201
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127.0.0.1 - - [30/Dec/2018 22:43:01] "GET / HTTP/1.0" 200 -
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210.49.93.254, 66.102.6.169
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127.0.0.1 - - [31/Dec/2018 09:17:47] "GET / HTTP/1.0" 200 -
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210.49.93.254, 66.102.6.173
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127.0.0.1 - - [31/Dec/2018 09:17:48] "GET /favicon.ico HTTP/1.0" 200 -
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112.140.176.2
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127.0.0.1 - - [01/Jan/2019 01:58:43] "GET / HTTP/1.0" 200 -
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112.140.176.2
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127.0.0.1 - - [01/Jan/2019 01:58:45] "GET /favicon.ico HTTP/1.0" 200 -
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112.140.176.2
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127.0.0.1 - - [01/Jan/2019 01:58:51] "POST / HTTP/1.0" 200 -
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112.140.176.2
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127.0.0.1 - - [01/Jan/2019 01:58:51] "GET /favicon.ico HTTP/1.0" 200 -
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112.140.176.2
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127.0.0.1 - - [01/Jan/2019 02:13:07] "GET /EviXDWpXvH HTTP/1.0" 200 -
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210.49.93.254, 66.102.6.171
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127.0.0.1 - - [02/Jan/2019 10:32:17] "GET / HTTP/1.0" 200 -
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210.49.93.254, 66.102.6.173
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127.0.0.1 - - [02/Jan/2019 10:32:18] "GET /favicon.ico HTTP/1.0" 200 -
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```
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The output will be a list of IP addresses in the file that looks like
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```
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103.252.153.201
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127.0.0.1
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210.49.93.254
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66.102.6.169
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127.0.0.1
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210.49.93.254
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66.102.6.173
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127.0.0.1
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112.140.176.2
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127.0.0.1
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112.140.176.2
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127.0.0.1
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112.140.176.2
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127.0.0.1
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112.140.176.2
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127.0.0.1
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112.140.176.2
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127.0.0.1
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210.49.93.254
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66.102.6.171
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127.0.0.1
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210.49.93.254
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66.102.6.173
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127.0.0.1
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```
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