The translation algorithm from pre-reform spelling into modern spelling, taking into account the morphology of words

Abstract The paper presents the translation algorithm from pre-reform spelling into modern one. The regularities in the errors made by pymorphy analyzer were used in the adaptation of it to the work with pre-reform spelling. On the basis of the dependencies between pre-reform and modern spelling for words, united by morphological characteristics, the exact algorithm, for processing the documents related to the late 19th – early 20th century, is proposed.