Groovy Script - Update the Document Revision Number to 2 digits if it is in 1 digit and is Numeric only, after the Document is uploaded

def execute(){

DocumentVO document = documentService.getDocumentDetails();

String revision = document.getRevision();

if (revision.length() == 1 && revision.matches("[0-9]+")) {

documentContext.getDocVO().revision = "0"+revision;

documentService.updateDocument(documentContext);

}

}