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So when a user submits a form it checks for phone number format because we pass a regex of a phone number in pattern attribute of HTML input. But the only pattern is not sufficient to fulfill our requirement. we need an HTML tag which is input type=”tel”, which is used for the telephone.
Here we will show how you can integrate phone number validation with HTML5. To validate a phone number with a regular expression (regex), we will use type and pattern attribute in HTML input field. The following example code validates a phone number and checks whether the user provided a phone number in the correct format (xxx-xxx-xxxx).
The pattern is a regex which checks for the format of the value which we put in the HTML input. So when a user submits a form it checks for phone number format because we pass a regex of a phone number in pattern attribute of HTML input.
To validate a phone number with a regular expression (regex), we will use type and pattern attribute in HTML input field. The following example code validates a phone number and checks whether the user provided a phone number in the correct format (xxx-xxx-xxxx).