fix: preprocess a script or style closed with whitespace before the bracket

.changeset/olive-beds-smell.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: preprocess `<script>` and `<style>` closed with whitespace before the bracket

packages/svelte/src/compiler/preprocess/index.js

@@ -251,9 +251,9 @@ function stringify_tag_attributes(attributes) {
 }
 
 const regex_style_tags =
-	/<!--[^]*?-->|<style((?:\s+[^=>'"/\s]+=(?:"[^"]*"|'[^']*'|[^>\s]+)|\s+[^=>'"/\s]+)*\s*)(?:\/>|>([\S\s]*?)<\/style>)/g;
+	/<!--[^]*?-->|<style((?:\s+[^=>'"/\s]+=(?:"[^"]*"|'[^']*'|[^>\s]+)|\s+[^=>'"/\s]+)*\s*)(?:\/>|>([\S\s]*?)<\/style\s*>)/g;
 const regex_script_tags =
-	/<!--[^]*?-->|<script((?:\s+[^=>'"/\s]+=(?:"[^"]*"|'[^']*'|[^>\s]+)|\s+[^=>'"/\s]+)*\s*)(?:\/>|>([\S\s]*?)<\/script>)/g;
+	/<!--[^]*?-->|<script((?:\s+[^=>'"/\s]+=(?:"[^"]*"|'[^']*'|[^>\s]+)|\s+[^=>'"/\s]+)*\s*)(?:\/>|>([\S\s]*?)<\/script\s*>)/g;
 
 /**
  * Calculate the updates required to process all instances of the specified tag.

packages/svelte/tests/preprocess/samples/whitespace-before-closing-bracket/_config.js

@@ -0,0 +1,8 @@
+import { test } from '../../test';
+
+export default test({
+	preprocess: {
+		script: ({ content }) => ({ code: content.replace('__NAME__', 'world') }),
+		style: ({ content }) => ({ code: content.replace('red', 'blue') })
+	}
+});

packages/svelte/tests/preprocess/samples/whitespace-before-closing-bracket/input.svelte

@@ -0,0 +1,11 @@
+<script>
+	let name = '__NAME__';
+</script >
+
+<p>{name}</p>
+
+<style>
+	p {
+		color: red;
+	}
+</style >

packages/svelte/tests/preprocess/samples/whitespace-before-closing-bracket/output.svelte

@@ -0,0 +1,11 @@
+<script>
+	let name = 'world';
+</script>
+
+<p>{name}</p>
+
+<style>
+	p {
+		color: blue;
+	}
+</style>