Features needed
- Supports matching against binary data (not just character data)
- Implements POSIX longest leftmost match algorithm
- Uses non-backtracking algorithm to avoid exponential worst-time behavior
Survey of Java regular expression libraries
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this page has moved to https://cwiki.apache.org/
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Of these, the automaton library looks the most interesting from a DFA perspective.
No POSIX longest match regex library for java/scala (as far as we can tell)
Notes for implementing our own regular expression engine
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Regular Expression Matching Can Be Simple And Fast (but is slow in Java, Perl, PHP, Python, Ruby, ...) (http://swtch.com/~rsc/regexp/regexp1.html) -
Introduces several implementation techniques
Regular Expression Matching: the Virtual Machine Approach (http://swtch.com/~rsc/regexp/regexp2.html)
Discusses several implementation details, including a section on POSIX longest leftmost matching. Includes some links to some test suites for POSIX matching rules.
Regular Expression Matching in the Wild (http://swtch.com/~rsc/regexp/regexp3.html)
- Tour of the re2 library (written in C++) - useful for translating the implementation to Java or Scala (which no one has apparently done yet)
- Someone started a binary parser and pickler combinator library. https://github.com/teigen/byteme Still looks immature, but might provide some good ideas.
Miscellaneous notes:
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