Regular Expressions 101

^start of line

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Group type(?<type>\w+)

\w+any word character, repeated at least once

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Group severity(?<severity>\w+)

\w+any word character, repeated at least once

,the literal , (44₁₀ / 54₈ / 2C₁₆)

Group timestamp(?<timestamp>\d+-\d+-\d+T\d+:\d+:\d+.\d+Z)

\d+a digit, repeated at least once

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d+a digit, repeated at least once

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d+a digit, repeated at least once

Tthe literal T (84₁₀ / 124₈ / 54₁₆) (case sensitive)

\d+a digit, repeated at least once

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\d+a digit, repeated at least once

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\d+a digit, repeated at least once

.any character (except for line terminators)

\d+a digit, repeated at least once

Zthe literal Z (90₁₀ / 132₈ / 5A₁₆) (case sensitive)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

Group node_name(?<node_name>[^:]*)

Negated Character Class[^:]*

*matches any number of characters outside the set below:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Group 5([^:]+)

Negated Character Class[^:]+

+matches at least one character outside the set below:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Group source(?<source>[^\]]+)

Negated Character Class[^\]]+

+matches at least one character outside the set below:

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

Group message(?<message>.*(?:\n(?!\[\w+:).*)*)

.*any character (except for line terminators), repeated any number of times

Non-Capturing Group(?:\n(?!\[\w+:).*)*

*repeats the group contents below any number of times:

\na line-feed (newline) character (ASCII 10)

Negative Lookahead(?!\[\w+:)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\w+any word character, repeated at least once

:the literal : (58₁₀ / 72₈ / 3A₁₆)

.*any character (except for line terminators), repeated any number of times

$end of line

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

x

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25 tokens

Regular Expression

^\[(?<type>\w+):(?<severity>\w+),(?<timestamp>\d+-\d+-\d+T\d+:\d+:\d+.\d+Z),(?<node_name>[^:]*):([^:]+):(?<source>[^\]]+)\](?<message>.*(?:\n(?!\[\w+:).*)*)$

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