Fast(er) regular expression engines in Ruby

&gt; Another nuance was found in ruby, which cannot scan the haystack with invalid UTF-8 byte sequences.<p>This is extremely basic ruby: UTF-8 encoded strings must be valid UTF-8. This is not unique to ruby. If I recall correctly, python 3 does the same thing.<p><pre><code> 2.7.1 :001 &gt; haystack = &quot;\xfc\xa1\xa1\xa1\xa1\xa1abc&quot; 2.7.1 :003 &gt; haystack.force_encoding &quot;ASCII-8BIT&quot; =&gt; &quot;\xFC\xA1\xA1\xA1\xA1\xA1abc&quot; 2.7.1 :004 &gt; haystack.scan(&#x2F;.+&#x2F;) =&gt; [&quot;\xFC\xA1\xA1\xA1\xA1\xA1abc&quot;] </code></pre> This person is a senior engineer on their Team page. All they had to do was google &quot;ArgumentError: invalid byte sequence in UTF-8&quot;. Or ask a coworker... the company has Ruby on Rails applications. <i>headdesk</i>

I wonder how std.regex of dlang would fare in such test. Sadly due to a tiny bit of D’s GC use it’s hard to provide as a library for other languages. If there is an interest I might take it through the tests.

Eww, pretending to support utf8 matchers while not supporting them at all was not pretty to see.

Honestly that part bugs me, fake support is worse than no support imo