Additional fields with regex

I will need extract fone number by regex in additional field, but I didn’t find where the code is included.

Need more info…
Could you provide steps to reproduce it?

I need to extract phone numbers or email address from eml, docs or pdfs and add this additional fields in Index for facet search.

I debuged the code, but not find the method that extract content file.

I think that after tika extract the content file I call the regex extract method. In Open Semantic Search there is a regex extract plugin for this.

(from is a mapping parameter.
The source code is AbstractFessFileTransformer.