How to remove a single class only in Javascript using Regex?

This question already has an answer here:

How do you use a variable in a regular expression? 16 answers

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Use the RegExp constructor instead of a RegExp literal. The constructor takes a string as its first param, so you can build it any way you like.

function remove_class(div, klass) {
    div.className = div.className.replace( new RegExp('(?:^|s)' + klass + '(?!S)'), '' );
}

Notice that no delimiters (the leading and trailing forward slashes) are needed when using the constructor.

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相反使用/ regexp /语法你可以使用RegExp：像这样：

function remove_class(div, klass) {
    var regex = new RegExp('/(?:^|s)' + klass + '(?!S)/');
    div.className = div.className.replace( regex , '' );
}

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You can create the regexp like so:

var re = new RegExp("regex","g");

Check out https://stackoverflow.com/a/494046/1778812

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