/wro4j-core/src/main/java/ro/isdc/wro/model/resource/processor/impl/CommentStripperProcessor.java
result = MultiLineCommentStripperProcessor.PATTERN.matcher( null).replaceAll( StringUtils.EMPTY) ;
result = MultiLineCommentStripperProcessor.PATTERN.matcher ( result ) .replaceAll ( StringUtils.EMPTY ) ;
implements ResourcePreProcessor, ResourcePostProcessor { public void process(final Resource resource, final Reader reader, final Writer writer) throws IOException { try (reader; writer) { final String content = IOUtils.toString(reader); String result = SingleLineCommentStripperProcessor.PATTERN.matcher(content).replaceAll(StringUtils.EMPTY); <extra_id_0> result = WroUtil.EMTPY_LINE_PATTERN.matcher(result).replaceAll(StringUtils.EMPTY); writer.write(result); } } public void process(final Reader reader, final Writer writer) throws IOException {