# File lib/maruku/input/parse_span_better.rb, line 449
        def read_ref_id(src, con)
                src.ignore_char # [
                src.consume_whitespace
#               puts "Next: #{src.cur_chars(10).inspect}"
                if m = src.read_regexp(R_REF_ID) 
#                       puts "Got: #{m[1].inspect} Ignored: #{m[2].inspect}"
#                       puts "Then: #{src.cur_chars(10).inspect}"
                        m[1]
                else
                        nil
                end
        end