On 2021-10-14 06:41:30 E. Liddell wrote:
> On Wed, 13 Oct 2021 16:02:14 -0500
>
> J Leslie Turriff <jlturriff@xxxxxxxx> wrote:
> > On 2021-10-13 13:07:13 E. Liddell wrote:
> > > On Wed, 13 Oct 2021 16:46:20 +0000
> > >
> > > That being said, test 9 is a raw grep being performed on an XML file.
> > > This means that it could easily be latching onto something in a
> > > comment, because following the full XML spec for determining whether a
> > > given line is inside a comment or not using a simple text-matching tool
> > > is . . . well, let's say it isn't something I'd want to try, and I deal
> > > in regexes a fair amount in my day job. It really needs to be run
> > > through a full parser that constructs a DOM tree.
> >
> > Filter to throw away comments first, then filter for what it should look
> > for.
>
> Correctly throwing away comments isn't as simple as tossing away everything
> between a start marker and an end marker, though, because if the comment
> marker is inside a CDATA section, it doesn't actually affect whether or not
> the text is a comment. I suspect a comment marker found between quotes in
> a text-format attribute value doesn't count either, but I'd have to check
> the spec to be sure. And there may be more quirks that I've forgotten.
> (Oh, and you could *easily* embed the value the grep expression is looking
> for in the file without triggering the grep by using CDATA, now that I
> think about it.)
>
> There's a reason that man perlfaq6 contains the following:
>
> How do I match XML, HTML, or other nasty, ugly things with a regex?
> Do not use regexes. Use a module and forget about the regular
> expressions.
>
> E. Liddell
Yeah. I know little about it, but IIRC, XML was supposed to make everything so much
easier... :-D
Leslie
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