javascript - Node js中的字符串正则表达式替换

Question

我的 Node 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.";

这里我想替换<b class =\"b_1\">*</b>与 '' .输出为 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。这就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');

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解释:

<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

然后我们将整个匹配替换为第一个捕获的组 $1表示 <b></b> 的内容标签。

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示例:

var str = "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.";

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

console.log(newString);

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Regex101 example .