Regular Expressions 101

(?ms)applies the following effective flags to the remainder of the pattern: gms

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

s modifier: single line. Allows a dot to match line terminators

Valuethe literal text Value (case sensitive)

\s+any whitespace character, repeated at least once

0:the literal text 0:

\s+any whitespace character, repeated at least once

Group value0(?<value0>[^ ]+)

Negated Character Class[^ ]+

+matches at least one character outside the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

Valuethe literal text Value (case sensitive)

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?ms)Value\s+0:\s+(?<value0>[^ ]+)Value

New

Mon Mar  9 14:18:14 2020: Unknown trap (.1.1.1.1.1..1) received from hostname.abcd.com at: 
Value 0: hostname.abcd.com
Value 1: 1.2.3.4
Value 2: 11.22.33.44

Another sample value is 

Mon Mar  9 13:38:23 2020: Unknown trap (.1.2.3.4.5.6) received from 19.19.19.19 at: 
Value 0: 19.19.19.19
Value 1: 4.4.4.4.4
Value 2: 12.13.14.15

Regular Expression

Substitution