|| always imposes a scalar context on its left hand operand, which is also why you can't usefully say @a = @b || @c.
One way to work around that in this case is to use the ternary operator instead:
$a = ("ac" =~ /a(b)c/) ? $1 : 'd';
print $a;
Update: Another approach is to use an array dereference, which is a way of retaining the ||, though I think it is less clear:
$a = ("abc" =~ /a(b)c/)[0] || 'd';
print $a;
Hugo
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