Regular Expression for Password Strength Validation

Question

I have written a regular expression which could potentially be used for password strength validation:

^(?:([A-Z])*([a-z])*(\\d)*(\\W)*){8,12}$

Answer 1

Try it ==>

var PasswordStrength = function () {
    var p_worker = {
        checkMark: function ( msg, mark ) {
            let strength = "Required!!!", status = true;
            switch ( mark ) {
                case 1: strength = ' Password strength: Weak...'; break;
                case 2: strength = ' Password strength: Semi-weak...'; break;
                case 3: strength = ' Password strength: Medium...'; break;
                case 4: strength = ' Password strength: Strong...'; break;
                default: status = false; break;
            }
            return { status: status/*[is valid or not]*/, cur_strength: strength/**[strength msg]*/, req_msg: msg/**[required msg]*/, mark: mark/**[strength mark]*/ };
        },
        setting: {
            n: { rgx: /[0-9]/, msg: '1 Numeric character' },
            c: { rgx: /[A-Z]/, msg: '1 Alphabet character' },
            s: { rgx: /[a-z]/, msg: '1 Small character' },
            sp: { rgx: /[@#$\.%^&+=]/, msg: '1 Special character' },
        }
    };
    return {
        check: function ( value ) {
            let msg = "", mark = 0, c = 0;
            for ( let i in p_worker.setting ) {
                if ( !p_worker.setting[i]['rgx'].test( value ) ) {
                    if ( c === 3 ) {
                        msg += '[*] ' + p_worker.setting[i]['msg'] + '';
                        c++; continue;
                    }
                    msg += '[*] ' + p_worker.setting[i]['msg'] + ',
';
                    c++; continue;
                }
                if ( c === 3 ) {
                    msg += ' ' + p_worker.setting[i]['msg'] + '';
                    mark++; c++; continue;
                }
                msg += ' ' + p_worker.setting[i]['msg'] + ',
';
                mark++; c++;
            }
            return p_worker.checkMark( msg, mark );
        }
    }
}();

Use ==>

PasswordStrength.check( "1234$#" );