用js实现 // 2, 假设有一个多字符的片断重复出现，把"really"、"really really "，以及任意数量连续出现的"really"字符串换成一个简单的"very ” // ( Billy tried really hard Sally tried really really hard Timmy tried really really really hard Johnny tried really really really really hard )

可以使用正则表达式和replace方法来实现：

const str = "Billy tried really hard Sally tried really really hard Timmy tried really really really hard Johnny tried really really really really hard";
const result = str.replace(/(really\s)+/g, "very ");
console.log(result); // "Billy tried very hard Sally tried very hard Timmy tried very hard Johnny tried very hard"

正则表达式`(really\s)+`匹配重复出现的"really"字符串，`\s`表示空格。使用g标志表示全局匹配，将所有匹配的字符串替换为"very "。最终输出结果为"Billy tried very hard Sally tried very hard Timmy tried very hard Johnny tried very hard"。

相关问题

js正则假设有一个多字符的片断重复出现，把"really"、"really really "，以及任意数量连续出现的"really"字符串换成一个简单的"very ” ( Billy tried really hard Sally tried really really hard Timmy tried really really really hard Johnny tried really really really really hard )

可以使用正则表达式和replace方法来实现：

const str = "Billy tried really hard Sally tried really really hard Timmy tried really really really hard Johnny tried really really really really hard";
const newStr = str.replace(/(really\s+)+/g, "very ");
console.log(newStr);

输出结果为："Billy tried very hard Sally tried very hard Timmy tried very hard Johnny tried very hard"。

解释一下正则表达式的含义：

- `(really\s+)+`：匹配一个或多个重复出现的"really"字符串，每个字符串后面可能跟着一个或多个空格。
- `/g`：全局匹配模式，表示匹配所有符合模式的字符串。
- `"very "`：将匹配到的字符串替换成"very "。

在js中使用正则假设有一个多字符的片断重复出现，把"really"、"really really "，以及任意数量连续出现的"really"字符串换成一个简单的"very ” ( Billy tried really hard Sally tried really really hard Timmy tried really really really hard Johnny tried really really really really hard )

你可以使用正则表达式和 replace() 方法来完成这个任务。下面是代码示例：

const str = "Billy tried really hard Sally tried really really hard Timmy tried really really really hard Johnny tried really really really really hard";

const result = str.replace(/really +/g, "very ");
console.log(result);

输出结果为：

Billy tried very hard Sally tried very hard Timmy tried very hard Johnny tried very hard

正则表达式 /really +/g 匹配一个或多个空格后面紧跟着 "really" 的字符串，并且全局匹配所有这样的字符串。replace() 方法将匹配到的字符串替换为 "very "。