function solve() {
    $('#submit').on('click', (ev) => {
        ev.preventDefault()
        let username = $('#username').val()
        let email = $('#email').val()
        let password = $('#password').val()
        let confirmPass = $('#confirm-password').val()

        let usernamePattern = /[a-zA-Z0-9]{3,20}/g;
        let passPattern = /[a-zA-Z0-9_]{5,15}/g;
        let emailPattern = /^.*\@.*\..*$/g;

        if (!usernamePattern.test(username)){
            $('#username').css('border-color', 'red')
        } else{
            $('#username').css('border', 'none')
        }

        if (!passPattern.test(password)){
            $('#password').css('border-color', 'red')
        } else {
            $('#username').css('border', 'none')
        }

        if (!passPattern.test(confirmPass)){
            $('#confirm-password').css('border-color', 'red')
        } else {
            $('#confirm-password').css('border', 'none')
        }

        if (!emailPattern.test(email)){
            $('#email').css('border-color', 'red')
        } else {
            $('#email').css('border', 'none')
        }



        $('#company').on('change', (event) => {
            if(document.getElementById('company').checked){
                $('#companyInfo').css("display","block")
            }
            else {
                $('#companyInfo').css("display","none")

            }
        });

    })
}