Syntax: list or range of characters, as inside REX []
The Language Characters setting controls what characters
constitute a language query. Query terms composed entirely of these
characters are considered language terms, and have Word Forms
processing applied. Additionally, during linear/post-process searches
(e.g. hit highlighting on the Match Info page), potential matches of
language or wildcard query terms will be expanded to include all
adjacent characters that are part of this setting, and the match
rejected if it does not match the query term (this prevents the query
term pond from matching the text term correspondence, for
example).
The syntax is a list of characters (no separation), and/or a range of
characters; the same as a REX character class (without the brackets).
The default is \alpha\'\x80-\xFF, i.e. alphabetic, hi-bit (for
UTF-8) and apostrophe (for contractions). For best results, all
characters that could match part of a Word Definition expression
(here) should usually also be listed in
Language Characters.
