Regular Expressions 101

^start of line

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Group timestamp(?P<timestamp>(\d{4}\/\d{2}\/\d{2}\s+\d{2}:\d{2}:\d{2}\.\d{3}[\+\-]\d{2}:\d{2}|\d{4}\/\d{2}\/\d{2}\s+\d{2}:\d{2}:\d{2}))

Group 2(\d{4}\/\d{2}\/\d{2}\s+\d{2}:\d{2}:\d{2}\.\d{3}[\+\-]\d{2}:\d{2}|\d{4}\/\d{2}\/\d{2}\s+\d{2}:\d{2}:\d{2})

1st Alternative\d{4}\/\d{2}\/\d{2}\s+\d{2}:\d{2}:\d{2}\.\d{3}[\+\-]\d{2}:\d{2}

\d{4}a digit, repeated exactly 4 times

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\d{2}a digit, repeated exactly 2 times

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\d{2}a digit, repeated exactly 2 times

\s+any whitespace character, repeated at least once

\d{2}a digit, repeated exactly 2 times

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\d{2}a digit, repeated exactly 2 times

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\d{2}a digit, repeated exactly 2 times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{3}a digit, repeated exactly 3 times

Character Class[\+\-]

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d{2}a digit, repeated exactly 2 times

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\d{2}a digit, repeated exactly 2 times

2nd Alternative\d{4}\/\d{2}\/\d{2}\s+\d{2}:\d{2}:\d{2}

\d{4}a digit, repeated exactly 4 times

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\d{2}a digit, repeated exactly 2 times

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\d{2}a digit, repeated exactly 2 times

\s+any whitespace character, repeated at least once

\d{2}a digit, repeated exactly 2 times

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\d{2}a digit, repeated exactly 2 times

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\d{2}a digit, repeated exactly 2 times

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

Non-Capturing Group(?:\[(?<logLevel>[^\]]+)\])*

*repeats the group contents below any number of times:

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

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

Negated Character Class[^\]]+

+matches at least one character outside the set below:

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

\]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

Regular Expression

^\[(?P<timestamp>(\d{4}\/\d{2}\/\d{2}\s+\d{2}:\d{2}:\d{2}\.\d{3}[\+\-]\d{2}:\d{2}|\d{4}\/\d{2}\/\d{2}\s+\d{2}:\d{2}:\d{2}))\](?:\[(?<logLevel>[^\]]+)\])*

New

[2006/01/02 15:04:05.000-07:00] lorem ipsum
[2006/01/02 15:04:05] dolorem doipsum
[2006/01/02 15:04:05.000+01:00]  abrakadabra
[2006/01/02 15:04:05]  eresh piklosh nemeshchi hunyad sczepenh kamosh