jRuby bug with encoding

gistfile1.rb

#-*- coding: utf-8 -*-

str = "<h1>Bugs#index</h1>

<%= @user %>

<p>á</p>"

str =~ /(?m-ix:<%(=+|-|\#|%)?(.*?)([-=])?%>([ \t]*\r?\n)?)/

match = Regexp.last_match()
puts match.begin(0)
puts match.end(0)

# $ rvm use jruby-1.6.3
# Using /home/everton/.rvm/gems/jruby-1.6.3
# $ ruby test.rb
# 21
# 0

# $ rvm use ruby-1.9.2
# Using /home/everton/.rvm/gems/ruby-1.9.2-p180
# $ ruby test.rb
# 21
# 34