Support negative index for tag when extract placeholders #1908
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For example,
tag is `fluentd.test.output`
`${tag[-1]}` is extracted to `output`
`${tag[-2]}` is extracted to `test`
It is useful to extract last element of variable length tag.
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Some output plugins supports negative index for tag placeholders. |
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LGTM. Thanks. |
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For example,
tag is
fluentd.test.output${tag[-1]}is extracted tooutput${tag[-2]}is extracted totestIt is useful to extract last element of variable length tag.