# File lib/maruku/input/extensions.rb, line 32
        def self.register_span_extension(args)
                e = SpanExtension.new
                e.chars = [*args[:chars]]
                e.regexp = args[:regexp]
                e.block = args[:handler] || raise("No blocks passed")
                e.chars.each do |c|
                        (SpanExtensionsTrigger[c] ||= []).push e
                end
        end