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<?php $content = '[btn href="(.?)" "(.?)"]'; echo preg_replace('#\[btn href="(.*?)" "(.*?)"\]#i', '<a href="$1" class="btn"> $2</a>', $content);
Output for git.master, git.master_jit, rfc.property-hooks
<a href="(.?)" class="btn"> (.?)</a>

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