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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><a href="" class="btn"> </a><a href="" class="btn"> </a><a href="" class="btn"> </a><a href="" class="btn"> </a><a href="" class="btn"> </a><a href="" class="btn"> </a><a href="" class="btn"> </a><a href="" class="btn"> </a><a href="" class="btn"> </a><a href="" class="btn"> </a><a href="" class="btn"> </a><a href="" class="btn"> </a><a href="" class="btn"> </a><a href="" class="btn"> </a><a href="" class="btn"> </a><a href="" class="btn"> </a><a href="" class="btn"> </a><a href="" class="btn"> </a><a href="" class="btn"> </a><a href="" class="btn"> </a><a href="" class="btn"> </a>]

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