module ActiveRecord::ConnectionAdapters::SQLite3::Quoting::ClassMethods

def column_name_matcher
  /
    \A
    (
      (?:
        # "table_name"."column_name" | function(one or no argument)
        ((?:\w+\.|"\w+"\.)?(?:\w+|"\w+") | \w+\((?:|\g<2>)\))
      )
      (?:(?:\s+AS)?\s+(?:\w+|"\w+"))?
    )
    (?:\s*,\s*\g<1>)*
    \z
  /ix
end