Issue #19327: Fixed the working of regular expressions with too big charset.
Issue #19287: Fixed the "in" operator of dbm.ndbm databases for string
argument.  Original patch by Arfrever Frehtes Taifersar Arahesis.
Issue #19288: Fixed the "in" operator of dbm.gnu databases for string
argument.  Original patch by Arfrever Frehtes Taifersar Arahesis.