itext7 - iText7 pdfSweep 编辑超出预期

Question

使用 pdfSweep 时，它编辑的文本比预期的要多。为什么还要编辑“JS”？

    PdfDocument pdfDoc = new PdfDocument(reader, writer);
    CompositeCleanupStrategy cleanupStrategy = new CompositeCleanupStrategy();
    cleanupStrategy.add(new RegexBasedCleanupStrategy("032016"));
    cleanupStrategy.add(new RegexBasedCleanupStrategy("123123123"));
    PdfAutoSweep autoSweep = new PdfAutoSweep(cleanupStrategy);
    autoSweep.cleanUp(pdfDoc);