No named captures in 'expression' parameter error in multiline in_tail
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- Dominant language
- Ruby
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Description
I try to create a multiline parse via the in_tail configuration and I got the `No named captures in 'expression' parameter. The regexp must have at least one named capture` error. From what I understand there is no `expression` parameter in multiline? Only `format_firstline` and `formats`?

I have the 1.2.1 version.
Am I doing something wrong?
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