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