fix the error that "/" in attribute value make indentation problem (#985)

* fix xml non self closing tags can not match "/" in attribute value
* Optimized indented regular expressions, borrowed from html pattern

---------

Co-authored-by: wangxi <[email protected]>

Author: wangxi761

src/client/indentation.ts

@@ -11,12 +11,12 @@ export function getIndentationRules(): LanguageConfiguration {
     },
     onEnterRules: [
       {
-        beforeText: new RegExp(`<([_:\\w][_:\\w-.\\d]*)([^/>]*(?!/)>)[^<]*$`, 'i'),
-        afterText: /^<\/([_:\w][_:\w-.\d]*)\s*>/i,
+        beforeText: /<(?:[_:\w][_:\w\-.\d]*)(?:(?:[^'"/>]|"[^"]*"|'[^']*')*?(?!\/)>)[^<]*$/i,
+        afterText: /^<\/(?:[_:\w][_:\w-.\d]*)\s*>/i,
         action: { indentAction: IndentAction.IndentOutdent }
       },
       {
-        beforeText: new RegExp(`<(\\w[\\w\\d]*)([^/>]*(?!/)>)[^<]*$`, 'i'),
+        beforeText: /<(?:\w[\w\d]*)(?:(?:[^'"/>]|"[^"]*"|'[^']*')*?(?!\/)>)[^<]*$/i,
         action: { indentAction: IndentAction.Indent }
       }
     ]