Bootstrap Form Validation

The form below is built in Bootstrap 5.0, using HTML5 and CSS3. The validation is done through RegEx and written in Javascript (ECMAScript 6.0).

You input was validated. Great success!

I used the following RegEx patterns:

First name: /^[a-z ,.'-]+$/i

Last name: /^[a-z ,.'-]+$/i

Date of birth: /^[\d]{2}-[\d]{2}-[\d]{4}/i

Mobile number: /^(\+|\d)[0-9]{7,16}$/i

Land line = /^0[1-6]\d{1,2}\d{7}|^\+31[1-6]\d{1,2}\d{7}/i

IBAN = See explanation