Email address contains more than three special chars(punctuation) is removed by Docsplit.clean_text method

I have a email in the pdf like **mohan-ramanujam@gmail.com** or **mohan.raman.visal@gmail.com**, the corresponding line number the text_cleaner.rb file is
` 
81       (w[1...-1].scan(PUNCT).uniq.length >= 3) ||
`
@knowtheory, @jashkenas , @samuelclay : Please provide your opinion on this.