This package contains regular expressions for the following XML tokens:
BaseChar, Ideographic, Letter, Digit, Extender, CombiningChar, NameChar,
EntityRef, CharRef, Reference, Name, NmToken, and AttValue.

The definitions of these tokens were taken from the XML spec
(Extensible Markup Language 1.0) at http://www.w3.org/TR/REC-xml.

Also contains the regular expressions for the following tokens from the
XML Namespaces spec at http://www.w3.org/TR/REC-xml-names:
NCNameChar, NCName, QName, Prefix and LocalPart.

WWW: https://metacpan.org/release/XML-RegExp