Could you explain what does it mean @{$rec->vals}.

@{$rec->vals}
can be written as
@{$rec->vals()}
or as
my $aref = $rec->vals();
@{$aref}

Is it array ref?

$rec->vals() is an expression that returns an array reference.
@{$rec->vals()} is an expression that returns an array lvalue (which means it can be used like a real array).

Update: Fixed problem noted by merlyn.

In reply to Re^3: Splitting array into two with a regex by ikegami
in thread Splitting array into two with a regex by jredburn

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