节点js中的字符串正则表达式替换

Question

我的节点js中有以下字符串。

var textToReplace = "Your <b class =\"b_1\">1</b> payment due is $4000.Your 
<b class =\"b_1\">2</b> payment due is $3500. Your <b class =\"b_1\">3</b> 
payment due is $5000.";

这里我想<b class =\"b_1\">*</b>用''. 输出是Your 1 payment due is $4000.Your 2 payment due is $3500. Your 3 payment due is $5000.。

如果这是一个正常的替换我不会有任何问题，但在这里我认为最好的替换方法是使用正则表达式。这是我感到困惑的地方。在java中我们有一个stringVariableName.replaceAll()方法。请让我知道我该怎么做。

谢谢

Answer 1

var newString = textToReplace.replace(/<b.*?>(.*?)<\/b>/g, '$1');

说明：

<b.*?> : matches the <b ...> opening tag (using the non-greedy quantifier to match as few as possible)
(.*?)  : matches the content of the <b></b> tag (should be grouped so it will be used as a replacement text), it uses the non-greedy quantifier too.
<\/b>  : matches the closing tag
g      : global modifier to match as many as possible

然后我们用$1代表<b></b>标签内容的第一个捕获组替换整个匹配。

例子：

var newString = textToReplace.replace(/<b.*?>(.*?)<\/b>/g, '$1');

Regex101 示例。