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Get the prev / next page links only (not title, <a> etc)

I currently use the following method to get a prev / next blog page link:

<?php previous_post_link( '%link', '%title' ); ?>

However this includes the outer element, name etc, I want just the link e.g. http://domain.com/blog/page/2

Is there a function that I’m not seeing to suit my requirements?

Clarification

Many thanks