xsd regular expression support for character classes about clixon

[dcornejo]

RFC 7950 sec 9.4.5 references W3 XML Schema Part 2 as the standard for the regular expressions used in the pattern statement: https://www.w3.org/TR/2004/REC-xmlschema-2-20041028/#regexs

[olofhagsand]

Thanks for the reference link.
I added translation for \w, \d, \s, and some others. Please come back if there are other POSIX vs XSD regex mismatches.
However, it would be better if one could reuse an xsd regex check tool. Know of anyone?

[dcornejo]

these guys have a lot of tools I've found useful: https://yangcatalog.org/
(especially the YANG regex validator). If you explore their github, you can find the source for a version of grep (w3cgrep) that is behind their validator. It uses the regex lib from libxml2.