def smg(s, re)
    if s =~ re then
        groups = ""
        sep = ""
        $~.names.each { |nm| 
            if $~[nm]
                groups += "#{sep}#{nm} = <<#{$~[nm]}>>"
                sep = ", "
            end
            }
        p "#{$`}<<#{$&}>>#{$'}"
        puts groups if !groups.empty?
        true
    else
        puts "no match"
        false
    end
end