Add details about why not all logstash patterns are supported (#3971)
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@ -108,10 +108,11 @@ CUSTOM time layouts must be within quotes and be the representation of the
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"reference time", which is `Mon Jan 2 15:04:05 -0700 MST 2006`
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See https://golang.org/pkg/time/#Parse for more details.
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Telegraf has many of its own
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[built-in patterns](./grok/patterns/influx-patterns),
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as well as supporting
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Telegraf has many of its own [built-in patterns](./grok/patterns/influx-patterns),
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as well as support for most of
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[logstash's builtin patterns](https://github.com/logstash-plugins/logstash-patterns-core/blob/master/patterns/grok-patterns).
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_Golang regular expressions do not support lookahead or lookbehind.
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logstash patterns that depend on these are not supported._
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If you need help building patterns to match your logs,
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you will find the https://grokdebug.herokuapp.com application quite useful!
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