HTML pattern Attribute

The HTML pattern attribute define a regular expression against which the <input> HTML element’s value is matched in an HTML document.


Following is the syntax −

<input pattern=”regular expression”>

Let us see an example of HTML pattern Attribute −


 Live Demo

<!DOCTYPE html>
   body {
      color: #000;
      height: 100vh;
      background: linear-gradient(62deg, #FBAB7E 0%, #F7CE68 100%) no-repeat;
      text-align: center;
   input[type='password'] {
      width: 300px;
      padding: 8px 16px;
      border: 2px solid #fff;
      background: transparent;
      border-radius: 20px;
      display: block;
      margin: 1rem auto;
      outline: none;
   .btn {
      background: #db133a;
      border: none;
      height: 2rem;
      border-radius: 20px;
      width: 330px;
      display: block;
      color: #fff;
      outline: none;
      cursor: pointer;
      margin: 1rem auto;
   ::placeholder {
      color: #000;
<h1>HTML pattern attribute Example</h1>
<form action="">
<input type="password" placeholder="Enter your account password" required pattern=".{8,}">
<input type="submit" value="Submit" class="btn" onclick='check()'>
<div class="show"></div>
   function check() {
      if (document.querySelector("input[type='password']").value.length < 8) {
         document.querySelector(".show").innerHTML = 'Please enter a password of more than or equal             to 8 characters.'


Enter a password which is less than 8 characters and then click on “Submit” button to show warning message.