Wrong close tag if tag name contains non-ASCII characters

[Boddlnagg]

For this XML snippet: <straße>foobar ... the extension creates the following closing tag: <straße>foobar</stra>

The file is encoded as UTF-8, and this should work.

[compulim]

Note to myself: XML element name rule can be found at http://www.xml.com/pub/a/2001/07/25/namingparts.html. Notably,

[4] NameChar ::= Letter | Digit | '.' | '-' | '_' | ':' | CombiningChar | Extender [5] Name ::= (Letter | '_' | ':') (NameChar)*

Our code at findTags.js currently look for tags using RegExp (reversed):

const TAG_PATTERN = />([0-9A-Za-z:\-_\.]*[A-Za-z\_])\/<|>\/[^\/]*?([0-9A-Za-z:\-_\.]*[A-Za-z\_])<|([0-9A-Za-z:\-_\.]*[A-Za-z\_])</g;

In order to allow extended NameChar, we might need to find tags without RegExp because the resulted pattern could be very large and unmaintainable.