Vim: Align second set of opening quotes using Tabular

I've been using the excellent Tabular plugin in Vim to align things, but there's an alignment I want to do pretty commonly that I can't figure out the right regex for.

I want this

gem 'fakeweb'
gem 'factory_girl', '~> 1.3'
gem 'factory_girl_rails', '>= 1.0'
gem 'rspec', '>= 2.0'
gem 'rspec-rails', '>= 2.0'

to turn into this

gem 'fakeweb'
gem 'factory_girl',       '~> 1.3'
gem 'factory_girl_rails', '>= 1.0'
gem 'rspec',              '>= 2.0'
gem 'rspec-rails',        '>= 2.0'

The cheat would be to align it o开发者_StackOverflown the comma, but that's not my ideal.

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By using the \zs in your regex you can set the start of the match to be the quote and not the comma.

:%Tabularize /,\s*\zs'/

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Anyone stumbling upon this question: :Tabularize argument_list also works.

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You should try the align plugin.