Find what: \b(А|a|В|в|Во|во|Да|До|до|За|за|И|и|Из|из|Их|К|к|Ко|ко|На|на|Не|не|Ни|ни|Но|но|О|о|Об|об|От|от|По|по|С|с|Со|со|То|У|у|Уж|Я)(\s)Change to: $1~S