delete keys in redis using scan method

redis_keys_purger.rb

require 'redis'
require 'yaml'
require 'redis/connection/hiredis'
require 'redis-namespace'

def redis_config
  YAML.load_file('/home/prodeng/apps/shared/config/redis.yml')['production']
end

def redis
  r = Redis.new(:host => redis_config["host"],
                    :port => redis_config["port"],
                    :driver => redis_config["driver"].to_sym,
                    :password => redis_config["password"])
  Redis::Namespace.new('production', redis: r)
end

def conn
  @redis ||= redis
end

conn.scan_each(match: 'B[_|Z]*') do |key|
  conn.del(key)
end
conn.scan_each(match: 'LK:*') do |key|
  conn.del(key)
end