This attribute plays a crucial role in verifying input field values when a form is submitted. It effectively works with various types of input, such as text, date, search, URL, phone, email, and password.
By defining a regular expression in the “pattern” attribute, developers can ensure that the entered data meets specific criteria.
It is relevant to mention that when using the “pattern” attribute, including the global “title” attribute is a recommended practice.
The “title” attribute provides additional description of the pattern, assisting users by offering information about the format or requirements necessary for data input.
To deepen your knowledge of regular expressions, we suggest exploring our JavaScript tutorial, where you will find detailed information about this powerful validation tool.
<form>
<label for="country_code">Country code:</label>
<input type="text" id="country_code" name="country_code"
pattern="[A-Za-z]{3}" title="Three letter country code">
</form>
In summary, the “pattern” attribute is a fundamental element to ensure the integrity and validity of data provided by users in web forms.
