Replace Language Key Within String In Blade Using Regex?

Hello everyone,

I'm stuck on regex, blah! Ok what I'm trying to do is have language tags (keys) within an article's content, then before the content gets displayed find and replace the keys with Lang::get('master.KEY') the key is wrapped with {{}} within my content I would like to replace the curly brackets.

<li class="content">{!! $article->content) !!}</li>

I was thinking you could do something like:

<li class="content">{!! preg_replace('/{{ (\w+) }}/i', Lang::get('master.${1}'), $article->content) !!}</li>

But this does not work it just shows the content with the {{ KEY }} still in it.