title: Regular Expression Validator for Letters and Numbers only
body: <p>What is the Regular Expression Validator for only Letters and Numbers in asp.net? </p>
  
  <p>I need to enter only 0-9,a-z and A-Z. I don't want to allow any special characters single or double quotes etc. I am using asp.net 3.5 framework. </p>
  
  <p>I tried <code>^[a-zA-Z0-9]+$</code> and <code>^[a-zA-Z0-9]*$</code>. They are not working.</p>
  
  <p>Any help will be appreciated.</p>