_pre_000x_sep_000x_sep_000x_post_ format: upper [from_char[,to_char]] makes field UPPERCASE default: whole field upper_w [word_nr[,...] make words in field UPPERCASE default: first word substr from[,len] returns substring from some character in some length default: len - rest of the string skip2nr skip all aphanumeric caracters and return just numbers after it. To output "1992." from "cop. 1992." initial [word_nr[,...]] make word(s) into initials (upper case first char and append dot after it) default: first word filter: name of filter which is stored in filters/[name].pm