See here:
public Reader filterRuleSetFile(InputStream stream) throws IOException { byte[] bytes = IOUtils.toByteArray(stream); String encoding = determineEncoding(bytes); String ruleset = new String(bytes, encoding); ruleset = applyAllFilters(ruleset); return new StringReader(ruleset); }applyAllFilters performs a bunch of regex replacements on the entire String, which creates many copies of it. We could do better by only filtering the ref attributes when parsing a rule reference node, this just seems very inefficient.
@jsotuyod This may offset your performance comparison of DOM and SAX for #724
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