title: Search special characters using to_tsquery
body: <p>How to construct to_tsquery to search for special characters like , "_", etc... ?</p>
  
  <p>I have entry in my tsvector column like "v_130" and I would like to search for "v_130" but when I construct to_tsquery such as to_tsquery('v_130:*') it doesn't return any records.</p>