As long as you're golfing, how about: 
perl -pe'$_ x=/^[A-Z]/i'

[download]
Update: trimmed a couple more chars...

-Blake

In reply to Re2: [perlrun/perlre] one-liner to match "readable" lines by blakem
in thread [perlrun/perlre] one-liner to match "readable" lines by princepawn

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