Jan 30, 2018, 10:19 AM
Post #1 of 3
A pattern question
I've encountered this pattern
if ($aa =~ /(?(DEFINE)(?<optional_a>a?))^(?&optional_a)a$/x)
I pretty much understand, or could find in perldoc, an explanation for all components of that pattern. I assume that there is an explanation for what I could not find.
Could somebody point me the explanation of this component: