title: How to replace the first occurrence of character 'e' in a string with 's' in oracle?
body: <p>like in my table-column first_name consists of values</p>
  
  <p>first_name:</p>
  
  <pre><code>leena,
  stev,
  neene,
  ajay,
  vine.
  </code></pre>
  
  <p>and my question is that i only want to replace the first occurrence of character 'e' with 's' and the other occurrence of 'e' must remains the same that is it would not be replaced by 's'. And i need the output like below.</p>
  
  <pre><code>lsena,
  stsv,
  nsene,
  ajay,
  vins.
  </code></pre>