<input name="mobile_number" id="mobilenumber" type="number" class="input-text" title="<?= $block->escapeHtml(__('Mobile Number')) ?>" placeholder="<?= $block->escapeHtml(__('Mobile Number')) ?>" data-validate="{required:true,mobile_ksa:true,maxlength:7}"> $.validator.addMethod( 'mobile_ksa', function (phone_number, element) { return this.optional(element) || phone_number.length > 9 && phone_number.match(/^(05)(5|0|3|6|4|9|1|8|7)([0-9]{7})$/); }, $.mage.__('wrong phone number. example: 05xxxxxxxx')); }); the above code i am using for validation it working when i click on button […]