[Plugin: WordPress SEO by Yoast] How to truncate words using title settings commands?

How do I truncate words in title settings command? For example %%title%% yields the word “Google.com” but instead of this output I want it to output to truncated version like this “Google” and remove “.com”. %%title%% + what? Is this feature/method support? If so, what is the modifier for this? Thank you.

http://wordpress.org/extend/plugins/wordpress-seo/

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