title: Characters does not replace in string
body: <p>I have a phone number like this</p>
  
  <blockquote>
    <p>+43 0431 15903412</p>
  </blockquote>
  
  <p>But at my <code>EditText</code> this is the input I give</p>
  
  <blockquote>
    <p>431 903412</p>
  </blockquote>
  
  <p>The only thing I need is to add a 0 before 4 and 15 before 9, is there any regex or simple way of adding this without looping through all the characters in my string and replacing by index ?</p>
  
  <p>I did this to add the +43 0</p>
  
  <pre><code>val modifiedPhoneNumber = "+430$phoneNumber"
  </code></pre>
  
  <p>But now I need to add the 15 before 9 and I dont know how</p>
  
  <p>Thanks</p>