title: SQL to find last alpha value in a string
body: <p>I need to find last alhpa value in a string . </p>
  
  <p>My string will be like below :</p>
  
  <pre><code>  thj_ujk_008j_1  
    tky_ujk_098f_*/_2
  </code></pre>
  
  <p>My result should be :  </p>
  
  <pre><code>  j  
    f
  </code></pre>