fix: update guide hint to properly declare regex (#34625)

guide/chinese/certifications/javascript-algorithms-and-data-structures/regular-expressions/reuse-patterns-using-capture-groups/index.md

@@ -19,8 +19,8 @@ let testString = "test test test ";
 如果我们要正面翻译正则表达式，它看起来像这样：
 
 ```js
-let re = /(test)\s\1; 
- let literalRe = /test\stest; 
+let re = /(test)\s\1/; 
+ let literalRe = /test\stest/; 
 ```
 
 `rea`和`literalRe`都会匹配相同的东西。
@@ -58,4 +58,4 @@ let repeatNum = "42 42 42";
  let reRegex =  /^(\d+)\s\1\s\1$/; 
  let result = reRegex.test(repeatNum); 
 
-```
+```