fix: code block regex (#1755)

Author: kermanx

packages/slidev/node/syntax/transform/code-wrapper.ts

@@ -2,7 +2,7 @@ import type { MarkdownTransformContext } from '@slidev/types'
 import { normalizeRangeStr } from './utils'
 
 // eslint-disable-next-line regexp/no-super-linear-backtracking
-export const reCodeBlock = /^```([\w'-]+)(?:\s*\{([\w*,|-]+)\}\s*?(\{[^}]*\})?([^\r\n]*))?\r?\n(\S[\s\S]*?)^```$/gm
+export const reCodeBlock = /^```([\w'-]+)?\s*(?:\{([\w*,|-]+)\}\s*?(\{[^}]*\})?([^\r\n]*))?\r?\n(\S[\s\S]*?)^```$/gm
 
 /**
  * Transform code block with wrapper

test/__snapshots__/transform-all.test.ts.snap

@@ -47,5 +47,15 @@ Foo \`{{ code }}\`
 </style>
 
 
+<CodeBlockWrapper v-bind="{}" :ranges='[]'>
+
+\`\`\`ts
+function _foo() {
+  // ...
+}
+\`\`\`
+
+</CodeBlockWrapper>
+
 </template>"
 `;

test/transform-all.test.ts

@@ -26,6 +26,8 @@ Foo \`{{ code }}\`
 <style>
 .text-green { color: green; }
 </style>
+
+<<< ./fixtures/snippets/snippet.ts#snippet
 `)
 
   applyMarkdownTransform(ctx)