Date:        Thu, 26 Sep 2019 22:58:10 +0100
    From:        Harald van Dijk <a...@gigawatt.nl>
    Message-ID:  <b03e4139-1b2a-cd4a-19ed-9caded044...@gigawatt.nl>


  | 9.3.5 rule 1:

  | "shall be followed by" is a requirement on applications, is it not?

It is.

  | When that requirement is violated, the regular expression or shell
  | pattern is  undefined,

>From where do you draw that conclusion, I see nothing to that effect.

Rather, when that requirement is violated, what exists is not
a character class (or one of the others).   That is all one can
conclude from that text.

kre


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