\s*[a-z_][a-zA-Z0-9_]*\s*)(,\g)*,?\s*$)|.*/(?1: |)/}${2:v}${2/(^(?\s*[a-z_][a-zA-Z0-9_]*\s*)(,\g)*,?\s*$)|.*/(?1:|)/} $0 end]]> returning source.ruby.rails returning do |variable| … end