title: Split and append
body: <ul>
  <li>Input:- A89456FRERT120108A.1
  <li>Output expected:- 120108AT.1
  </ul>
  
  <p>I am thinking of the below ...can anyone help me if there is an easier way to achieve this, I  need to append "T" for the alphanumeric character</p>
  
  <ol>
  <li>Split based on "."
  <li>Get the alphanumeric character for `split[0]` once the first digit is encountered (which is "120108A" in this case)
  <li>Append "T" to #2 (it will be 120108AT)
  <li>Then put back `split[1]` (120108AT.1)
  </ol>