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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Rich Felker‏ @RichFelker 16 Dec 2015

      Regex exercise: Rewrite ERE (a|b)*, where a and b are individually expressible as BRE, in BRE.

      1 reply 0 retweets 0 likes
    2. Jonas Termansen‏ @sortiecat 17 Dec 2015
      Replying to @RichFelker

      @RichFelker I came to the conclusion POSIX BRE without extensions is not a regular language. Need \| for it to be.

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker 17 Dec 2015
      Replying to @sortiecat

      @SortieCat Languages representable by BRE are surely regular; your claim seems to be that it's incapable of describing _all_ regular langs.

      9:51 AM - 17 Dec 2015
      2 replies 0 retweets 0 likes
        1. New conversation
        2. Jonas Termansen‏ @sortiecat 17 Dec 2015
          Replying to @RichFelker

          @RichFelker Ah. (a*b*)*.

          1 reply 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker 17 Dec 2015
          Replying to @sortiecat

          @SortieCat Yep. Alternatively you can use \{0,1\} in place of ?. But I don't see a way to do (a|b) without the *.

          1 reply 0 retweets 0 likes
        4. Jonas Termansen‏ @sortiecat 17 Dec 2015
          Replying to @RichFelker

          @RichFelker Ah, it slipped my mind \{0,1\} is BRE, forgot to check that when looking up if \? was.

          1 reply 0 retweets 0 likes
        5. Jonas Termansen‏ @sortiecat 17 Dec 2015
          Replying to @sortiecat

          @RichFelker Assuming subexpression anchor extension (permitted by POSIX) (^a$)\{0,1}(^b$)\{0,1} gets close, but matches empty string too.

          1 reply 0 retweets 0 likes
        6. Rich Felker‏ @RichFelker 17 Dec 2015
          Replying to @sortiecat

          @SortieCat I was assuming this could all be part of a larger expression (that's needed for generality), so anchoring is not useful.

          1 reply 0 retweets 0 likes
        7. Jonas Termansen‏ @sortiecat 17 Dec 2015
          Replying to @RichFelker

          @RichFelker Yep, or if you want to match part of a string, not the whole string, as regexec does. Just thinking out loud.

          0 replies 0 retweets 0 likes
        8. End of conversation
        1. Jonas Termansen‏ @sortiecat 17 Dec 2015
          Replying to @RichFelker

          @RichFelker Right, that was what i meant to say. Not all regular languages can be described by BRE.

          0 replies 0 retweets 0 likes
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