如何从字符串中捕获数组格式的子字符串

Question

I want to get an array-formatted substring which is inside of the input(). I used preg_match but can't get the entire expression. It is stopping at the first ). How can I match the entire substring? Thank You.

$input="input([[1,2,nc(2)],[1,2,nc(1)]])";
preg_match('@^([^[]+)?([^)]+)@i',$input, $output); 

Expectation is:

'[[1,2,nc(2)],[1,2,nc(1)]]'

Answer 1

This pattern match your desired string (also with starting word ≠ ‘input’:

@^(.+?)\((.+?)\)$@i

<kbd>eval.in demo</kbd>

^(.+?)   => find any char at start (ungreedy option)
\)       => find one parenthesis 
(.+?)    => find any char (ungreedy option) => your desired match
\)       => find last parenthesis