Extended maintenance of Ruby 1.9.3 ended on February 23, 2015. Read more
# File irb/completion.rb, line 214
def self.select_message(receiver, message, candidates, sep = ".")
candidates.grep(/^#{message}/).collect do |e|
case e
when /^[a-zA-Z_]/
receiver + sep + e
when /^[0-9]/
when *Operators
#receiver + " " + e
end
end
end