After strip_tags: <b title=''>test</b>
After regex: <b>test</b>
After strip_tags 2: <b onmouseover=alert(1)>test</b>
After regex 2: <b>test</b>
After strip_tags 3: <b
onmouseover=alert(1)>test</b>
After regex 3: <b>test</b>
After strip_tags 4: <b onmouseover="alert('')">test</b>
After regex 4: <b>test</b>