I need to process hundreds of multilingual text files each of which requires some specific preprocessing such as removing undesirable characters or formatting changes. During prototyping I developed a main process_document program which includes functions to filter specific files. However I don't want to have to include hundreds of subroutines. I would like to let a user specify a module and function to be called by the program. 
ex: process_document -f Module::filter_function -i file_name

where process_document does:
# parse -f argument into $module, $function
eval "require $module";

# openfile 
# $document set to document
# do some stuff to $document

#do user specified processing
$document = $function($document);

# do more stuff

[download]
I can't get the string $function to be executed as the filter_function. Any ideas would be appreciated.

In reply to How to specify a specific Module::subroutine as command option by Anonymous Monk

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