如何使用 Javascript 在给定的句子中查找大写单词并在其之前添加一个字符？

Question

所以我有这样一个字符串：

var response = "Connecting to server Connection has been successful We found result";

我想在找到第二个大写单词后在每个大写单词前插入一个','。

我正在这样做：

var response = "Connecting to server Connection has been successful We found result";
var pattern=/[A-Z]/g;
document.write(response.replace(pattern,','));

结果：

,onnecting to server ,onnection has been successful ,e found result

我想要的：

Connecting to server,Connection has been successful, We found result

Answer 1

试试这个：

var str = "Connecting to server Connection has been successful We found result";

str.replace(/.[A-Z]/g, ',$&'); 

结果：正在连接服务器，连接成功，找到结果

When a match is found, if you want to include the matched text in the replacement string, you can access it using $&.

Answer 2

replace 一个 space 后跟一个带逗号的大写字母加上该分组 (</code>).</p> <pre><code>var res2 = response.replace(/( [A-Z])/g, ',');

DEMO

Answer 3

您可以使用正则表达式和正则先行。

String#replace(/ (?=[A-Z])/g, ', ')

document.write('Connecting to server Connection has been successful We found result'.replace(/ (?=[A-Z])/g, ', '));