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<?php $html = 'This is a demo paragraph with a wrapped string ~here~, with another string ~~here~~.'; echo preg_replace_callback('/~~([\s\S]*?)~~(?!~)|~([^~]*)~/', function ($m) { return !empty($m[1]) ? '<span class="classTwo">' . $m[1] . '</span>' : '<span class="classOne">' . $m[2] . '</span>'; },$html);
Output for git.master, git.master_jit, rfc.property-hooks
This is a demo paragraph with a wrapped string <span class="classOne">here</span>, with another string <span class="classTwo">here</span>.

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