title: Need regular expression for 4-12 alphanumeric characters or special characters (~!@$%&*_+) at least one letter, no spaces
body: <p>Please see below examples which needs to be satisfied with the regular expression.</p>
  
  <p>Rule : 4-12 alphanumeric characters or special characters (~!@$%&amp;*_+)  at least one letter, no spaces</p>
  
  <pre><code>test                  ---------This is Valid
  test@2                ---------This is Valid 
  test2                 ---------This is Valid
  2222                  ---------This is NOT Valid
  2222@                 ---------This is NOT Valid 
  @2222                 ---------This is NOT Valid
  test user2            ---------This is NOT Valid
  testUser              ---------This is Valid
  testUser@2            ---------This is Valid 
  testUser2             ---------This is Valid
  testUser.2            ---------This is NOT Valid
  </code></pre>