Regular Expressions 101

Pro

1st Alternative(?<=: ).+

Positive Lookbehind(?<=: )

: the literal text :

.+any Unicode character (except for line terminators), repeated at least once

2nd Alternative(?:[\da-zA-Z-]|(?<=\d):(?=\d))+

Non-Capturing Group(?:[\da-zA-Z-]|(?<=\d):(?=\d))+

+repeats the group contents below at least once:

1st Alternative[\da-zA-Z-]

Character Class[\da-zA-Z-]

\da Unicode decimal digit

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

2nd Alternative(?<=\d):(?=\d)

Positive Lookbehind(?<=\d)

\da Unicode decimal digit

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Positive Lookahead(?=\d)

\da Unicode decimal digit

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.

25 tokens

(?<=: ).+|(?:[\da-zA-Z-]|(?<=\d):(?=\d))+

New

<30>Jan 11 11:45:50 test-tt systemd[1]: tester-test.service: activation successfully.