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https://issues.apache.org/jira/browse/DAFFODIL-1917?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Beckerle updated DAFFODIL-1917:
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Priority: Minor (was: Major)
> Support for new character classes
> ---------------------------------
>
> Key: DAFFODIL-1917
> URL: https://issues.apache.org/jira/browse/DAFFODIL-1917
> Project: Daffodil
> Issue Type: New Feature
> Components: Back End, Front End, Middle "End"
> Reporter: Steve Lawrence
> Priority: Minor
>
> Daffodil v2.0 wishlist includes new character class entities LSP, LSP* and
> LSP+, which are the same as WSP except they do not match line endings. This
> is useful as currently it is impossible to match an empty line followed by a
> newline via something like %WSP*;%NL; due to the greediness of WSP* and the
> inability for our delimiter scanner to backtrack of forward lookahead.
> Related, it might be useful to also add NL+ and NL* to match an unbounded
> number of newlines.
> Additionally, it might be a good idea to cause an SDE if a character class
> that contains * or
> + is immediately followed by a character inside that character class. The
> reason being that such sequences will always fail without lookahead or
> backtracking, which probalby isn't worth implementing.
> For security reasons, we should also implement a tunable to limit the number
> or repetitions of these character entities.
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