title: Input text validation while input?
body: <p>In my html page i want user to add a string in specific order in <code>input type=text</code>.</p>
  <p>if i use pattern in input tag then the error will pop while submiting form and i want it while typing.</p>
  <p>The required pattern is <code>4Letters and then 4Numbers No white Space No Special Character Allowed</code></p>
  <p>The Pattern i used in my backend is <code>^[A-Z]{4}[0-9]{4}$</code></p>
  <p>How can i achieve this ?</p>
  <p><strong>Edit</strong></p>
  <p>To The Moderators :
  <strong>I Never said that the error was because of typo. Where did i mentioned it ? Closing question did not provides solution whoever it was you should have read the thread.</strong></p>
  <p>I haven't accepted answers as they are not working as intended.
  Working on the solution.</p>
  <p>Need this thread to opened again. Thank you</p>