Can Verbal Expressions <https://metacpan.org/pod/Regexp::VerbalExpressions> (stripped of syntactic treacle) serve as such nice BNF-ish format? E.g.
# Create an example of how to test for correctly formed URLs start_of_line "http" maybe "s" then "://" maybe "www." anything_but " " end_of_line This can be extended as needed for advanced Perl regex features and replace function. Such BNF format would also provide nice syntax highlighting hardly possible with regex'es and, with a superset of Regexp::Common and pattern reuse functionality turn into a DSL of its own. Is MarpaX::Regex::Verbal a thing worth trying? What do you think? On Tuesday, January 15, 2013 9:51:25 PM UTC+2, Jeffrey Kegler wrote: > > There are a number of projects that would, I think, be quite popular and > useful but which I simply don't have the cycles to consider doing > myself. One is a Regex compiler -- a compiler from some nice BNF-ish > format, to Perl regular expressions. I'd think this could be very > popular -- it would be very much in the comfort zone of some programmers > who otherwise would not consider using Marpa. > > To be specific, this is another specialized Marpa-to-Perl compiler. The > compiler would write a Perl regex, and the Perl regex would be what > actually runs. The value added by Marpa would be that more complex > regexes could be more quickly and easily written, and the output regex > could be nicely pretty-printed and commented. > > Sometimes not understood is that one thing regular expressions *cannot* > parse is the representation of a regular expression. Regular > expressions are defined recursively, but they do not themselves deal > with recursion. > > One way to think of this project is as a Marpa super-superset of > Regexp::Common, whose functionality could be incorporated. A related > effort within Perl was the DEFINE predicate for sub-patterns, but DEFINE > had horrific syntax and AFAIK was little or never used. > -- You received this message because you are subscribed to the Google Groups "marpa parser" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
