Github user nishihatapalmer commented on the issue:
https://github.com/apache/incubator-metron/pull/541
Correct, there's no NFA or DFA under the hood of the SequenceMatcher.
You can create sequences using the regex syntax using the
SequenceMatcherCompiler, as long as only syntax which creates fixed length
sequences is used. So you can match bytes (hex values), sets of bytes [01 02
03], any bytes ., bitmasks, strings and case insensitive strings, but not
wildcards or optional bytes. For example:
01 ^02 'a string' [f0-ff] 'another string' [0a 0d]
The RegexCompiler can accept the full regex syntax including *, +, ?, and
it does create NFAs - but this isn't tested.
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