It seems that using (?PARNO) in my example speeds up coping against long random line of parentheses at least 10 times on average.
But still there are some frequent random data, that regex works slow. I changed the length of random line to 50000, and then sometimes regex cope in 0.1 sec, and sometimes it takes >5 sec.
I only changed regex a little bit: 
my $regex =
qr{
                           # start of full pattern
        \(                  # match an opening parenthesis
            (?:
                0        # everytime false, because of such DATA
                |           # OR
                (?0)        # recurse to capture full pattern
            )*
        \)                  # match a closing parenthesis
                           # end of  full pattern
}x;

[download]
One more question: how to find consecutive balanced parentheses (and their max length with frequency of them)? I used "+" quantifier in: m/$regex+/g (/$m+/g). Now if I use this quantifier, program works with really bad asymptotics, but if I use possesive m/$regex++/g, it run faster but still slow. Why?

In reply to Re^3: how to speed up that dynamic regex? by rsFalse
in thread how to speed up that dynamic regex? by rsFalse

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