/**
 * Validates value with regular expression
 */
function validateRegExp(aFormElement, oldValue, re, msg) {
  if (aFormElement.value == '') {
    return true;
  }
  if (!aFormElement.value.match(re)) {
    ret = confirm(eoltrans[msg]);
    if (!ret) {
      aFormElement.value = oldValue;
    }
    return false;
  } else {
    return true;
  }
}