I tested the regex with 1.8.7, 1.9.2, and JRuby 1.6.1.  All seem to hang and show the same behavior you see with REE.  Seems to be an issue with Ruby&#39;s regex engine on all distros.  FWIW, out of curiosity I ran the same regex in Perl, which handled it quickly and correctly.<br>
<div><br><div>Chris</div><div><br><div class="gmail_quote">On Tue, Jul 12, 2011 at 7:28 PM, John Nunemaker <span dir="ltr">&lt;<a href="mailto:nunemaker@gmail.com">nunemaker@gmail.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div>Posted the REE issue to the REE google group as well:</div><div><a href="https://groups.google.com/forum/#!topic/emm-ruby/EBkMfFpk40A" target="_blank">https://groups.google.com/forum/#!topic/emm-ruby/EBkMfFpk40A</a></div>
<div><br></div><div>The <a href="https://github.com/rack/rack/blob/1.3.0/lib/rack/backports/uri/common.rb#L61" target="_blank">regex used on line 61 in rack/backports/uri/common.rb</a> causes REE to hang for certain strings. I only know because it happened in production over and over the past week and today, with help, I was finally able to track it down.</div>
<div><br></div><div>Not sure if this is really an issue with Rack or just with REE, but it will affect anyone using Rack 1.3.0 and REE so I thought I would mention it here as well.</div></blockquote></div><br></div></div>