man Plucene::Analysis::LetterTokenizer () - Letter tokenizer
NAME
Plucene::Analysis::LetterTokenizer - Letter tokenizer
SYNOPSIS
# isa Plucene::Analysis::CharTokenizer
DESCRIPTION
This is the letter tokenizer class, which divides text at non-letters.
Note: this does a decent job for most European languages, but does a terrible job for some Asian languages, where words are not separated by spaces