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<?php $text = ' sdfsdaf sdafadsf #test sdfdsf'; $text = preg_replace('%(\A#(\w|(\p{L}\p{M}?)|-)+\b)|((?<=\s)#(\w|(\p{L}\p{M}?)|-)+\b)|((?<=\[)#.+?(?=\]))%u', '<a class="hashtag" href="https://google.com/?q='.urlencode('$4').'" target="_blank">$4</a>', $text, 10); echo ($text);
Output for git.master, git.master_jit, rfc.property-hooks
sdfsdaf sdafadsf <a class="hashtag" href="https://google.com/?q=%244" target="_blank">#test</a> sdfdsf

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