Last Updated : 11 Jul, 2025
The HTML pattern attribute is used with <input> elements to specify a regular expression that the input's value must match for the form to be submitted. It enforces specific formatting rules, like requiring a certain number of characters or specific character types.
Syntax:
<input pattern = "regular_exp">
Element: This attribute is associated with <input> element only.
Attribute: This attribute specifies the regular expression.
Example: In this example we use the pattern attribute to enforce a three-letter password. The input must match the specified pattern of three alphabetic characters, or it will not submit.
HTML
<!DOCTYPE html>
<html>
<head>
<title>pattern attribute</title>
<style>
body {
text-align: center;
}
h1 {
color: green;
}
</style>
</head>
<body>
<h1>GeeksforGeeks</h1>
<h2>pattern attribute</h2>
<form action="#">
<label for="userPass">Password:</label>
<input type="text"
name="password"
id="userPass"
pattern="[A-Za-z]{3}"
title="3 letter Password">
<input type="submit" value="submit">
</form>
</body>
</html>
Output :
Supported Browsers: The browser supported by pattern attribute are listed below:
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HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4