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webfinger.rb

class Webfinger
  def self.find_user(webfinger_name)

Webfinger likes to give fully qualified names. For example: “acct:wilkie@rstat.us” We are going to relax this format and look up usernames whether or not the name starts with acct: and whether or not it ends with @domain

This regex has essentially three parts: ([@\:]+\:)? = the optional prefix that ends with a colon ([@\:]*?) = the username (@[@\:]+)? = the optional domain that starts with an @

    username = webfinger_name[/^([^@\:]+\:)?([^@\:]*?)(@[^@\:]+)?$/, 2] || webfinger_name

    User.first :username => /^#{username}$/i
  end
end