title: validate textbox string for comma and Ampersand
body: <p>I need to validate the text box value with comma and Ampersand means if user enter , or &amp; symbol in text box it should show error .</p>
  
  <p>i have tried Regex for this but it didnt work the way i want </p>
  
  <pre><code>([a-zA-Z])*([,]|[&amp;])([a-zA-Z])*
  </code></pre>
  
  <p>anyone knows the regex for the same?</p>