How can I interpolate a variable in a Ruby regex?

 data.to_en开发者_开发问答um(:scan,/(#entity[0])/i).map do |m,|
        p $`.size

How can I use dynamic variable in regular expression? #entity[0] returns a value, but in the above syntax #entity[0] is taken literally in the regex.

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You want /#{entity[0]}/i. #{} is the syntax for variable insertion in strings and regexes.