https://rubygems.org/gems/commonregex?locale=de
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https://api.itextpdf.com/pdfSweep/java/5.0.1/com/itextpdf/pdfcleanup/autosweep/CommonRegex.html
CommonRegex (pdfSweep 5.0.1 API)
declaration: package: com.itextpdf.pdfcleanup.autosweep, class: CommonRegex
api