String tagName = m.group(1);
String testAttrName = m.group(2);
String testAttrValue = m.group(3);
String attrNameMatch = m.group(4);
String transformerName = p.getProperty(key);
StringTransformer transformer = transformers.get(transformerName);
if (transformer == null) {
LOGGER.warning("Unknown transformer name \"" +
transformerName + "\" for key \"" + key + "\"");
continue;
}