add custom format for telephone html code example
Example 1: html telephone link
One click should open the phone dialler and input the number to be called.
<a href="tel:5551234567">Call (555)123-4567</a>
Example 2: how to validate mobile number in html form
<div>
<label for="phone">Enter your phone number:</label>
<input type="tel" id="phone" name="phone" pattern="+94[7-9]{2}-[0-9]{3}-[0-9]{4}" value="+94">
</div>