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HTML <input> pattern Attribute

HTML input Tag Reference HTML <input> tag

Example

An HTML form with an input field that can contain only three letters (no numbers or special characters):

<form action="demo_form.asp">
Country code: <input type="text" name="country_code"
pattern="[A-Za-z]{3}" title="Three letter country code">
<input type="submit">
</form>

Try it yourself »

Definition and Usage

The pattern attribute specifies a regular expression that the <input> element's value is checked against.

Note: The pattern attribute works with the following input types: text, search, url, tel, email, and password.

Tip: Use the global title attribute to describe the pattern to help the user.

Tip: Learn more about regular expressions in our JavaScript tutorial.


Browser Support

The numbers in the table specify the first browser version that fully supports the attribute.

Attribute
pattern 5.0 10.0 4.0 Not supported 9.6


Differences Between HTML 4.01 and HTML5

The pattern attribute is new in HTML5.


Syntax

<input pattern="regexp">

Attribute Values

Value Description
regexp Specifies a regular expression that the <input> element's value is checked against


HTML input Tag Reference HTML <input> tag

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