ruby on rails - regular expression a string -

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i need regular expression convert following object:

"{:email=>[\"has been taken\"], :name=>[\"has been taken\"]}"

to 

email has been taken, name has been taken 

▶ str = "{:email=>[\"has been taken\"], :name=>[\"has been taken\"]}" ▶ eval(str).map { |k, v| [k.capitalize, v].join(' ') }.join(', ') #⇒ "email has been taken, name has been taken"

with scan:

▶ str.scan(/:(\w+)=>\["(.*?)"\]/).map |k, v| ▷   [k.capitalize, v].join(' ') ▷ end.join(', ') #⇒ "email has been taken, name has been taken"

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