url_regex = http://arglist.com/regex/regex3.8a.tar.gz
url_linpack = http://www.math.iastate.edu/burkardt/f_src/linpack_bench/linpack_bench.f
url_regex = http://arglist.com/regex/regex3.8a.tar.gz
url_linpack = http://www.math.iastate.edu/burkardt/f_src/linpack_bench/linpack_bench.f