How to handle something like [1,2,3] with html5 input type text?

September 14, 2022

I would like to know if we can handle specific input like the following examples using pattern:

[1] or
[1,2]

so basically brackets with a number or if there are more numbers then only comma allowed as a separator.

Tried [(\d+(\s*,?))+] as stated below but it doesn’t work.

This would do it:

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

^ – start line anchor
\[ – open literal square bracket
\d+ – one or more digits
(?: – open non-capturing group
- ,\d+ – comma followed by one or more digits
) – close non-capturing group
* – match pattern inside non-capturing group zero or more times
\] – close literal square bracket
$ – end line anchor