Безопасный пароль

$(document).ready(function(){ 
   $('#changePasswd').on('click',function(){
      $('#changePasswdErrors').html('');
      $('#changePasswdErrors').hide();
      let passwd = $('#passwd').val();
      let confPasswd = $('#confirm_passwd').val();
      let errors = [];
      if(passwd != confPasswd){
         errors.push("Password and password confirmation do not match");
      }
      else{
         if(passwd.length<8) {
            errors.push("Password length must be at least 8 characters");
         }
         if(passwd === passwd.toLowerCase()){
            errors.push("Password must contain uppercase characters");
         }
         if(passwd === passwd.toUpperCase()){
            errors.push("Password must contain lowercase characters");
         }
         if(!passwd.match(/(\d+)/g)){
            errors.push("Password must contain digits");
         }
         //!#$%&()*+./:;=>?@[\]^`{|}~'\
         let cpec = '!#$%&()*+./:;=>?@[]^`{|}~'+"'";
         let b = false;
         let s = '';
         for (let i = 0; i < cpec.length; i++) {
            s = cpec[i];
            if(passwd.indexOf(s)!==-1){
               b = true;
               break;
            }
         }
         if(!b){
            errors.push("Password must contain special character "+'!#$%&()*+./:;=>?@[]^`{|}~'+"'");
         }
         if(errors.length == 0){
            $('#changePasswdForm').trigger('submit');
         }
         else{
            $('#changePasswdErrors').html(errors.join('<br>'));
            $('#changePasswdErrors').show();
         }

      }

   });
});