See if you can guess what this code will do before you run it in ruby.
upc = Proc.new {|m| $1.upcase}
puts "hello world".gsub(/([aeiou])/, &upc)
puts "hello world".gsub(/(\w)/, &upc)
def doit(str, re, blk)
puts str.gsub(re, &blk)
end
doit "hello world", /([aeiou])/, upc
doit "hello world", /(\w)/, upcNow try running it in JRuby. Whoa.