regex101: IP addresses

Explanation

Pro

Group 1((?:[0-9]{1,3}\.){3}[0-9]{1,3})

Non-Capturing Group(?:[0-9]{1,3}\.){3}

{3}repeats the group contents below exactly 3 times:

Character Class[0-9]{1,3}

{1,3}matches between 1 and 3 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[0-9]{1,3}

{1,3}matches between 1 and 3 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

\sany whitespace character

Group 2((?:[0-9]{1,3}\.){3}[0-9]{1,3})

Non-Capturing Group(?:[0-9]{1,3}\.){3}

{3}repeats the group contents below exactly 3 times:

Character Class[0-9]{1,3}

{1,3}matches between 1 and 3 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[0-9]{1,3}

{1,3}matches between 1 and 3 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Quick Reference

25 tokens

Regular Expression

((?:[0-9]{1,3}\.){3}[0-9]{1,3})\s((?:[0-9]{1,3}\.){3}[0-9]{1,3})

New

<140>Mar 21 09:50:26 Biblica-M400 80DA036A10A65 (2019-03-21T15:50:26) firewall: msg_id="3000-0148" Allow 60-GUEST WIRELESS 0-External 60 tcp 20 63 172.16.60.35 192.243.232.7 38076 443 offset 10 S 936012176 win 65535 geo_dst="USA" (Outgoing-00)

Substitution

<140>Mar 21 09:50:26 Biblica-M400 80DA036A10A65 (2019-03-21T15:50:26) firewall: msg_id="3000-0148" Allow 60-GUEST WIRELESS 0-External 60 tcp 20 63 172.16.60.35 192.243.232.7 38076 443 offset 10 S 936012176 win 65535 geo_dst="USA" (Outgoing-00)