Regular Expressions 101

Pro

^start of line

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Character Class[\d:]+

+matches at least one character from the set below:

\da Unicode decimal digit

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\sa Unicode whitespace character

Group 1(WRN|INF|ERR)

1st AlternativeWRN

WRNthe literal text WRN (case sensitive)

2nd AlternativeINF

INFthe literal text INF (case sensitive)

3rd AlternativeERR

ERRthe literal text ERR (case sensitive)

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

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

^\[[\d:]+\s(WRN|INF|ERR)\]

New

[12:00:49 INF] hello
[12:00:49 WRN] world
[12:00:49 ERR] 123
[12:00:49 INF] 123
[12:00:49 WRN] world
[12:00:49 ERR] hello

[12:00:49 INF] hello
[12:00:49 WRN] world
[12:00:49 ERR] 123
[12:00:49 INF] 123
[12:00:49 WRN] world
[12:00:49 ERR] hello