Accumulates entries in submetrics, filtering with regular
expressions. If no regular expressions are given, matches
everything for the given measurement, which must implement
the CollectionMeasurement interface. Regular
expressions matching using Perl5Util from
Jakarta-ORO. This measurement will use
Perl5Util.group(1) if not null, otherwise the
full string.
This is the syntax for initializing this type of
measurement:
<init>
measurement name [perl regular expression]
...
</init>
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