Thepattern property of theHTMLInputElement interface represents aregular expression a non-null<input> value should match. It reflects the<input> element'spattern attribute.

Thepattern property is valid fortext,search,url,tel,email, andpassword types. It defines a regular expression that the input'svalue must match in order for the value to passconstraint validation.

If a non-null value doesn't conform to the constraints set by thepattern value, theValidityState object's read-onlypatternMismatch property will be true.

Value

A string.

Examples

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

Specifications

Browser compatibility

See also

• <input>
• HTMLInputElement.value
• Client-side validation
• :valid and:invalid pseudo-classes