Regular Expressions 101

Non-Capturing Group(?:\[([\S ]+)\]\n((?:[\s\S\n])(?!\n\[))*)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Group 1([\S ]+)

Character Class[\S ]+

+matches at least one character from the set below:

\Sany non-whitespace character

the literal (32₁₀ / 40₈ / 20₁₆)

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

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

Group 2((?:[\s\S\n])(?!\n\[))*

*repeats the group contents below any number of times:

Non-Capturing Group(?:[\s\S\n])

Character Class[\s\S\n]

\sany whitespace character

\Sany non-whitespace character

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

Negative Lookahead(?!\n\[)

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

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

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

(?:\[([\S ]+)\]\n((?:[\s\S\n])(?!\n\[))*)

New

[linux]
foo
faafaa

fii
[windows]

faa fii@@
<tag1>fuu</tag1>
foo1234

[osname3]
faa faa
[osname4]
fiifoo

[linux]
foo
faafaa

fii
[windows]

faa fii@@
<tag1>fuu</tag1>
foo1234

[osname3]
faa faa
[osname4]
fiifoo