Escape multiline.pattern

[indreek]

How is it possible to properly escape multiline.pattern? I did not find a way how pass single quotes to filebeat config.

multiline:
  pattern: '^[0-9]{4}-[0-9]{2}-[0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2}.[0-9]{3}'

becomes

multiline:
  pattern: '^[0-9]{4}-[0-9]{2}-[0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2}.[0-9]{3}'

And

multiline:
  pattern: "'^[0-9]{4}-[0-9]{2}-[0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2}.[0-9]{3}'"

becomes

multiline:
  pattern: '''^[0-9]{4}-[0-9]{2}-[0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2}.[0-9]{3}'''

According to https://www.elastic.co/guide/en/beats/filebeat/current//regexp-support.html it should remain "We recommend that you wrap regular expressions in single quotation marks to work around YAML’s string escaping rules. "

[botelastic]

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