How to write regex pattern on logstash input kakfa topics_pattern

 kafka {
    bootstrap_servers => "localhost:9092"
    # topics => ["techsupportforum__listings","black__listings"]
    topics_pattern => "\\*__listings"
    consumer_threads => 1
    decorate_events => true

hi, i have logstash input kafka, i have tried, topics_pattern but not working, if using topics working fine,

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