regex - Need regrex to separate the integer from the array to comma separated -

i looking have regrex passing value in array comma separated.here regrex used fetching value.

regrex : id="selectedagency(.+?)" using regrex able find below value matching in id="selectedagency[1]"

hence outcome receives follows:

&selectedagencies=[14],[12],[10],[9]

however have actual output below:

&selectedagencies= 14,12,10,9

thanks

remove [] use different regex:

 regex : id="selectedagency\[(\d+)