An HTML form with an input field that can contain only three letters (no numbers or special characters):
The pattern attribute is supported in Internet Explorer 10, Firefox, Opera, and Chrome.
Note: The pattern attribute of the <input> tag is not supported in Internet Explorer 9 and earlier versions, or in Safari.
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.
The pattern attribute is new in HTML5.
|regexp||Specifies a regular expression that the <input> element's value is checked against|
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