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Pattern Attribute Description:

The pattern attribute defines a regular expression for a pattern that form data should take when submitted in an HTML form.

This attribute is valid in HTML5.

The Pattern Attribute is Used with These Tags:

The Pattern Attribute Contains:

The pattern attribute contains a regular expression that the data must match to be submitted. The regular expression is based on JavaScript regular expressions.

Here is an example of an INPUT telephone field with a pattern looking for a phone number like this: “(###) ###-####.”

<input type="tel" id="phone" pattern="([0-9]{3}) [0-9]{3}-[0-9]{4}>

Pattern Default Value:

The pattern attribute default value is empty, so that no pattern is required to submit the data.

Pattern is Valid in HTML Versions:

  • HTMl5
  • XHTML5

Pattern Attribute DTD:

HTML5

<doctype html>

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