Re: [xsl] Need an XPath expression which returns all xs:pattern elements containing a regex that permits an unbounded number of characters

["Piez, Wendell A. (Fed) wendell.piez@xxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

Hello XSL-List,

Indeed (as Willem says). It's too bad we can't parse the regular expression
with a parser. But wait!

The real solution and the only truly 'easy' one (unless you like bleeding
edges) is Invisible XML or something like it.

https://invisiblexml.org/

find or make the iXML grammar and you're mostly there.

https://johnlumley.github.io/jwiXML.xhtml

https://github.com/usnistgov/ixml-breadboard includes XSLT integrations
(experiments that needed a home, though no regex grammar - yet).

Cheers, Wendell

From: Willem Van Lishout willemvanlishout@xxxxxxxxx
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Sent: Thursday, April 4, 2024 9:49 AM
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject: Re: [xsl] Need an XPath expression which returns all xs:pattern
elements containing a regex that permits an unbounded number of characters

Is this even possible, theoretically speaking? As soon as you start using
lookaheads, square brackets, and so on, your patterns will likely fail. I
don't think regex can parse regex.
On 4 Apr 2024, at 20:15, "David Carlisle
d.p.carlisle@xxxxxxxxx<mailto:d.p.carlisle@xxxxxxxxx>"
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx<mailto:xsl-list-service@xxxxxxxxxxxx
rytech.com>> wrote:


On Thu, 4 Apr 2024 at 13:29, Roger L Costello
costello@xxxxxxxxx<mailto:costello@xxxxxxxxx>
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx<mailto:xsl-list-service@xxxxxxxxxxxx
rytech.com>> wrote:
Hi Folks,

I want to find, in an XML Schema, all xs:pattern elements containing a regex
that permits an unbounded number of characters.

Here are examples of xs:pattern elements that I want to find:

<xs:pattern value="A*"/>
<xs:pattern value="A+"/>
<xs:pattern value="A{0,.}"/>
<xs:pattern value="A{1,.}"/>


How to fix my XPath expression? Is the solution to add a second predicate:

xs:pattern[
        contains(@value, '*') or
        contains(@value, '+') or
        contains(@value, '{1,}') or
        contains(@value, '{0,}')
    ][
        not(contains(@value, '\*')) and
        not(contains(@value, '\+'))
    ]

Is that correct?

No.

A  pattern \\*   matches an unbounded list of backslashes  but fails your test
as it contains \*
A pattern X{5,}  matches an unbounded list  of X of at least 5 but doesn't
match your first predicate.




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