Scan keys on Redis using Ruby code in Logstasg

Question

I use a pipeline in Logstash that have a config file of Ruby codes. In this file, I scan all logs in that pipeline with word table. I follow this structure as below:

def filter(event)
    red = Redis.new(host: "127.0.0.1", port: 6379, db: 7)
    start = 0
    key_collection = []
        
    index, keys = red.scan(start)
        
    while index != "0"
      start = index
      keys.each do |key|
         key_collection << key if key.include?('table')
      end
      index, keys = red.scan(start)
    end

   event.set(@is_valid, key_collection)

   return [event]
end

Is this way correct?

The key_collection << key if key.include?('table') does not work. How can I add all keys that include 'table*' in an array?