Would a closure be close to what you want?

Not really, as the snippet I pasted is part of a larger whole:

{
    my %exlinx;
    my $link       = qr/ \[ (?: ([^|\]]*) \| )? ([^\]]*) \] /x; # 1: u
+rl 2: text
    my $inlinetag = do {
        our $acc =
        qr/(?> \{          (?: (?> \\. | [^\\{}]+ | (??{ $acc }) ) )* 
+  \} )/x;
        qr/    \{ (\w+): ( (?: (?> \\. | [^\\{}]+ | (??{ $acc }) ) )* 
+) \}  /x;
    }; # 1: tag 2: text
    my $overig     = qr/(?: (?> \\. | [^{\[\\]+ ) )*/sx; # -: text
    my $stuff      = qr/(?> $overig ) | (?> $link ) | (?> $inlinetag )
+/x;
    my $paratag    = qr/(\w+):\s*/;
    my $n          = qr/\n\s*\n/;

    # These return html-ified versions of the input
    sub inlineparse { ... }
    sub paraparse { ... }
    sub colorize { ... }
}
[download]

it may help to note that (??{}) are done like quoted eval, compiled in an interlude during runtime.

That does help a little, but why doesn't it give me the famous Global symbol "$acc" requires explicit package name, then? I have no $acc declared in the scope where $inlinetag is being used.

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