You can clean the howto file with
iconv -f iso-8859-1 -t utf-8 howto > howto2
Line 12 can be rewritten with a compile-time generated Regex engine,
auto re = ctRegex!(r"([a-zA-Z][a-zA-Z0-9]*)://([^ /]+)(/?[^ ]*)");
if you feel it fair to sacrifice the command-line pattern option.
Rewritten to give D a strong chance at the benchmark. Unfortunately, there are some limitations to the D regex regarding encoding (As you found). https://dlang.org/phobos/std_regex.html#Unicode%20support
You can clean the howto file with
iconv -f iso-8859-1 -t utf-8 howto > howto2Line 12 can be rewritten with a compile-time generated Regex engine,
auto re = ctRegex!(r"([a-zA-Z][a-zA-Z0-9]*)://([^ /]+)(/?[^ ]*)");if you feel it fair to sacrifice the command-line pattern option.