NlpTools API
Namespace

NlpTools\Utils\Normalizers

English For English we simply transform to lower case using mb_strtolower.
Greek To normalize greek text we use mb_strtolower to transform to lower case and then replace every accented character with its non-accented counter part and the final ς with σ
Normalizer The Normalizer's purpose is to transform any word from any one of the possible writings to a single writing consistently.