ruby on rails 3 - What does this mean #(?-mix:facebook|twitter)? -

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what expression #(?-mix:facebook|twitter) mean in following output rake routes ?

user_omniauth_callback        /users/auth/:action/callback  users/omniauth_callbacks#(?-mix:facebook|twitter)

it's regular expression snippet , matches either facebook or twitter in position, , case-sensitive (so won't match facebook or twitter).

if want know more regular expressions start here :)


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