Why doesn't <STDIN> initialize and fill $_ in the following control block?

until(<STDIN> =~ /exit|quit|(^\s*$)/i) { }

I ended up leaving until(<STDIN>) by it's lonesome, then assigning $scalar = $_, then matching it to the above regex. Logic would dictate that there would be a more elegant solution. Thanks in advance!

In reply to $_ unitialized by alexx1523

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