An HTML form with an input field that can contain only three letters (no numbers or special characters):
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.
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 |
The pattern attribute is new in HTML5.
| Value | Description |
|---|---|
| regexp | Specifies a regular expression that the <input> element's value is checked against |
HTML <input> tag
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