Github user cestella commented on the issue: https://github.com/apache/metron/pull/836 So, answering your questions en-masse we use the following similar to how they exist in regex: * `*` - `0` or `n` instances * `?` - `0` or `1` instance * `+` - `1` or `n` instances In retrospect, this may not be as obvious as it seemed at the time. Think we need a key that indicates this? ;)
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