Help!

How do I get $1, $2, and $3 to get interpolated in the following 
snippet?

string = 'This is a test of the emergency'
regexp = Regexp.new('(\W)+(\w\w)(\W)+')
replacement = '$1->$2<-$3'
user_wants_upcase=FALSE

# Note: All variables above are set by the user of the program, so I 
don't know
# what they will contain before runtime.

string.gsub!(regexp) {
  return_value = string # Here, how do I get $1, $2, and $3 to 
interpolate?

  if (user_wants_uppercase)
    return_value.upcase! || return_value
  end

  return_value
}

I want return_value to be -> 'This ->is<- a test ->of<- the emergency'

Note: I know that I can get it to work with the non-block version of 
gsub! but I need to use the block version.

Thanks

Hector

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