Regular Expressions 101

Pro

^start of line

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Group 1([^][\r\n]*)

Negated Character Class[^][\r\n]*

*matches any number of characters outside the set below:

]the literal ] (93₁₀ / 135₈ / 5D₁₆)

[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\ra carriage return (ASCII 13)

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

]the literal ] (93₁₀ / 135₈ / 5D₁₆)

Negated Character Class[^\S\r\n]+

+matches at least one character outside the set below:

\Sany non-whitespace character

\ra carriage return (ASCII 13)

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

Group 2([^:\r\n]+)

Negated Character Class[^:\r\n]+

+matches at least one character outside the set below:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\ra carriage return (ASCII 13)

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

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Group 3(.*(?:\r?\n {4}.*)*)

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

Non-Capturing Group(?:\r?\n {4}.*)*

*repeats the group contents below any number of times:

\r?optionally matches a carriage return (ASCII 13)

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

{4}the literal (32₁₀ / 40₈ / 20₁₆) , repeated exactly 4 times

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

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

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25 tokens

^\[([^][\r\n]*)][^\S\r\n]+([^:\r\n]+):(.*(?:\r?\n {4}.*)*)

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