The Tekstaro de Esperanto (Corpus of Esperanto) is a text corpus of the Esperanto language, a large collection of very diverse texts for linguistic research on Esperanto. As of January 2019[update], the corpus has texts with a total of 5,177,208 words.[1] It is searchable by regular expressions, including custom search terms that are lexical (e.g., sequences of Esperanto letters) and grammatical (e.g., active participial suffixes, passive participial suffixes, adjectival suffixes, etc.).[2]