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if ($this_portion_of_string_is_a_url) {
  $this_portion_of_string_is_a_url =
    qq(<a href="$this_portion_of_string_is_a_url">$this_portion_of_str
+ing_is_a_url</a>);
}

sub make_URL_href($){
    my( $url ) = @_;
...
    }
    return $url;
}