ruby-1.9.3

Possible Duplicate: ruby-debug with Ruby 1.9.3? I had heard rumors that ruby 1.9.3p125 has a solution for the ruby-debug19 problem, so per instructions on the RVM site, I reinstalled 1.9.3: $ rvm reinstall 1.9.3 --patch debug --force-autoconf $ ruby -v ruby 1.9.3p125 (2012-02-16 revision 34643) [x86_64-darwin11.2.0] Then: gem install ruby-debug19 Added this entry to my Gemfile: gem 'ruby-debug19' Then: $ rails server -u => Booting WEBrick => Rails 3.1.3 application starting in development on http://0.0.0.0:3000 => Call with -d to detach => Ctrl-C to shutdown server You need to install ruby

I just gone through the docs for Atomic Grouping and rubyinfo and some quick questions came into my mind as follows: Why the name came as "Atomic grouping" ? What "atomicity" it has that general grouping doesn't have. How atomic grouping differs from the general grouping ? Why atomic groups are called non-capturing groups? I tried the below code to understand but had confusion about the output and how differently they work on the same string as well? irb(main):001:0> /a(?>bc|b)c/ =~ "abbcdabcc" => 5 irb(main):004:0> $~ => #<MatchData "abcc"> irb(main):005:0> /a(bc|b)c/ =~ "abcdabcc" => 0 irb

I just updated to Ruby 1.9.3p0 and Rails 3.1.1. Now when I try to launch the server, it complains that I should install ruby-debug , even though it's already installed. % rails server --environment=development --debug => Booting WEBrick => Rails 3.1.0 application starting in development on http://0.0.0.0:3000 => Call with -d to detach => Ctrl-C to shutdown server You need to install ruby-debug to run the server in debugging mode. With gems, use 'gem install ruby-debug' Exiting In my Gemfile I have # see: http://stackoverflow.com/questions/1083451/debugging-in-ruby-1-9 gem 'ruby-debug-base19',