fix: handle closing tags in attributes (#796)

* fix: handle closing tags in attributes

...when detecting script language
Related to sveltejs/language-tools#2204

* Update packages/vite-plugin-svelte/src/utils/compile.js

Co-authored-by: Dominik G. <dominik.goepel@gmx.de>

---------

Co-authored-by: Dominik G. <dominik.goepel@gmx.de>

Author: dummdidumm

.changeset/eleven-wombats-begin.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/vite-plugin-svelte': patch
+---
+
+fix: handle closing tags in attributes when detecting script language

packages/vite-plugin-svelte/src/utils/compile.js

@@ -7,7 +7,8 @@ import { log } from './log.js';
 import { createInjectScopeEverythingRulePreprocessorGroup } from './preprocess.js';
 import { mapToRelative } from './sourcemaps.js';
 
-const scriptLangRE = /<script [^>]*lang=["']?([^"' >]+)["']?[^>]*>/;
+const scriptLangRE =
+	/<script (?:[^>]*|(?:[^=>'"/]+=(?:"[^"]*"|'[^']*'|[^>\s]+)\s+)*)lang=["']?([^"' >]+)["']?[^>]*>/;
 
 import { isSvelte3, isSvelte5 } from './svelte-version.js';