How to match nested function invocations (bracket pairs) using a regular [removed]recursive?)

Question

I\'m looking for a regular expression (**) that will match an unknown number of nested functions. So

expression
function(expression)
function(function(expres         


        

Answer 1

Worth noting as per Bart Kiers's answer that some regex engines (excluding Javascript) have extended features to provide recursive matching - but such a feature shouldn't be considered to be a regular expression as per the formal definition.