字符串正则表达式替换节点js

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.";

我希望将<b class =\"b_1\">*</b>替换为''。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Regex。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。

由于

Answer 1

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

<强>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项替换为第一个捕获的组$1，该组代表<b></b>标记的内容。

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);

Regex101 example

Answer 2

您不一定需要RegEx，但使用jQuery可以轻松删除子项并使用经典的单行返回HTML：

textReplaced = $('<div>').html(textToReplace).children().remove().end().html();

这里的工作小提琴 - https://jsfiddle.net/7cgb51ju/

Answer 3

我会用这样的东西：

textToReplace.replace(/<b class =\"b_1\">[0-9]+<\/b>/g, '');

Answer 4

您只需要将 Regex capturing groups 与以下 Regex /<b.*?>(.*?)<\/b>/g一起使用，然后就可以在代码中使用它了这样：

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.";


console.log(textToReplace.replace(/<b.*?>(.*?)<\/b>/g, '$1'));

此处'$1'将保留(.*?)的第一个捕获组。