Regular Expressions 101

^start of line

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Non-Capturing Group(?:\d+(?:,\d+)*)?

?repeats the group contents below at most once:

\d+a digit, repeated at least once

Non-Capturing Group(?:,\d+)*

*repeats the group contents below any number of times:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\d+a digit, repeated at least once

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

$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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^\[(?:\d+(?:,\d+)*)?\]$

New

[1]
[1,2]
Nope
[]
[try]
['again']
[1,2,3]