Email from Hannes, 19.2.2010
Oniguruma brauchen wir, weil wir für gewisse Datenimporte sogenannte Regexp-lookbehind brauchen, die mit der Standard-Regexp-Engine von Ruby nicht möglich sind.
also see
http://www.justskins.com/forums/regex-look-behind-122616.html
a Ruby Forum post "Alternative for look behind"
http://www.ruby-forum.com/topic/162918
More about look-behinds from 2005
http://groups.google.com/group/comp.lang.ruby/browse_thread/thread/f0d76ceff808fbf9
More useful information
http://www.artima.com/forums/flat.jsp?forum=123&thread=145707
Some help howto install on windows
http://book.opensourceproject.org.cn/lamp/ruby/rubyway2nd/opensource/0768667208/ch03lev1sec13.html
A presentation mentioning Look-Behinds
http://www.scribd.com/doc/2589469/Migrating-to-Ruby-19