title: Postgres replace characters in string
body: <p>I have column with text where I need to change characters!
  For example </p>
  
  <ul>
  <li>�ay----> need to be Day</li>
  <li>�rag---->need to be Drag</li>
  </ul>
  
  <p>So I need to replace � with character D.
  I try next but I get error:invalid regular expression: quantifier operand invalid</p>
  
  <pre><code>update  tableT pp set descript=(select regexp_replace(descript,'�', 'D') 
  FROM 
    tableT kk where pp.id=kk.id) ;
  </code></pre>