joe, This hasn't been committed yet, but SOLR-822 may be your answer.
https://issues.apache.org/jira/browse/SOLR-822 Koji joeMcElroy wrote:
I need a custom filter to be added to a field which will replace specialforeign characters with their english counterpart.for example ø => oGrave À È Ì Ò Ù à è ì ò ù => A E I O U a e i o u Circumflex Â Ê Î Ô Û â ê î ô û => A E I O U a e i o uis this possible? joe