Ruby 2 syntax, $ ` -

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i've sound chunk of code, , can not understand syntax. , can not make search. code is

keys.map { |k| k =~ /\./; $` }

what mean $` ? tried play in console, did not understood how works

when using regex match string, $` matches string before current match. so:

irb> "hello world".match(/world/)  => #<matchdata "world"> irb> $`  => "hello "

i should add ruby doc reference: http://ruby-doc.org/core-2.0.0/doc/globals_rdoc.html

more info: if use 'english' library, ` can replaced word prematch:

irb> "hello world".match(/world/)  => #<matchdata "world"> irb> $`  => "hello " irb> $prematch   => nil irb> require 'english'  => true irb> $prematch   => "hello " irb>

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