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Our NBP application uses version number (stored in netbeans.buildnumber) which don't match regexp defined in org.netbeans.modules.options.export.OptionsExportModel.DATE_SIMPLE_REGEX. In previous NBP versions parseBuildNumber in OptionsExportModel permitted custom version numbers and org.netbeans.modules.options.export.OptionChooserPanel worked. Please fix OptionExportModel/OptionChooserPanel so that custom version numbers can be used again.