HTMLInputElement: pattern property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

The pattern property of the HTMLInputElement interface represents a regular expression a non-null <input> value should match. It reflects the <input> element's pattern attribute.

The pattern property is valid for text, search, url, tel, email, and password types. It defines a regular expression that the input's value must match in order for the value to pass constraint validation.

If a non-null value doesn't conform to the constraints set by the pattern value, the ValidityState object's read-only patternMismatch property will be true.

Value

A string.

Examples

js
const inputElement = document.getElementById("year");
console.log(input.pattern);

Specifications

Specification

HTML
# dom-input-pattern

Browser compatibility

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This page was last modified on Apr 10, 2025 by MDN contributors.

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