>>9
Proofs that he regrets them? I've found only this:
http://fredwu.me/post/36493181321/an-interview-with-yukihiro-matz-matsumoto
Zhou: Looking back, is there anything in Ruby you wish you did differently?
Matz: In the beginning my goal was to replace Perl as my tool therefore I have borrowed many ideas from Perl, such as using the dollar sign ($) to indicate special variables. Looking at it now it seems to be a little bit too much and too similar to Perl. There are a few other things but mainly I think it is too similar to Perl. Back then before the ruby idioms were formed, there were many things that were borrowed from Perl - nowadays I think many of them weren’t necessary thanks to the ruby and rails idioms.