def it
    IRB.CurrentContext.last_value
end

def rv
    RUBY_VERSION
end

def show_match(s, re)
    if s =~ re then
        "#{$`}<<#{$&}>>#{$'}"
    else
        "no match"
    end
end

def smg(s, re)
    if s =~ re then
        groups = ""
        sep = ""
        1.upto(20) { |n| 
            if $~[n]
                groups += "#{sep}$#{n} = <<#{$~[n]}>>"
                sep = ", "
            end
            }
        groups = "         " + groups if !groups.empty?
        "#{$`}<<#{$&}>>#{$'}#{groups}"
    else
        "no match"
    end
end

alias :sm :show_match