Low effort anonymisation script a `rails-erd` generated `.dot` file (which I used to submit a Graphviz bug report)

anon.rb

dot = ARGF.read

matches = Hash.new { |h, k| h[k] = "Anonymized_#{rand 9999}" }
replaced1 = dot.gsub(/\b"?m_([A-Za-z0-9_:]+)"?\b/) { |m| m.sub(%r|\b#{$1}\b|, matches[$1]) }

regexp = Regexp.union(matches.keys.map { |k| Regexp.new(k) })

replaced2 = replaced1.gsub(regexp) { |m| matches[m] }

puts replaced2