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\[ - open literal square bracket(?: - open non-capturing group
\d+ - one or more digits(?: - open non-capturing group
,\d+ - comma followed by one or more digits) - close non-capturing group* - match pattern inside non-capturing group zero or more times) - close non-capturing group? - make the preceding non-capturing group content optional; basically, allow for empty []\] - close literal square bracket$ - end line anchor