Using a 5v regulator on arduino uno?

Firstly would it be ok to use a 5v regulator on an arduino uno with a 12v lipo battery, and which pins would it be connected to on my arduino. Lastly while I am here does anyone know the name of this 5v regulator?

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The picture http://m.imgur.com/gNlrpNb is a Mega. But, anyway, with a Uno you can connect the 12 Volt cell directly to the Uno’s power jack without any additional regulator, observing polarity of course.

Thanks, I was wondering would it make it any easier to include a power button?

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Thanks!