Logstash: If message contains regex add field



within my Logstash config I'm searching for a regex pattern. If a logfile is found which matches the regex a new field should be added with the found pattern.
The if statement is working but I don't know how to save the exact pattern to a new field. This is my code at the moment:

input {
  stdin { }

filter {
  if [message] =~ "[0-9|A-Z]{11}" {
    mutate {
      add_field => {"message-id" => "found pattern from above" }

output {
  stdout { codec => rubydebug }

(system) #2

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