How Can I Use Variables in JavaScript's `String.replaceAll()` with Regular Expressions?

Integrating Variables into Regular Expressions

When seeking a concise approach for JavaScript's String.replaceAll() method, regular expressions often emerge as an ideal solution. However, incorporating variables within these expressions poses a challenge. While it is feasible to directly replace characters, such as replacing "B" with "A", the goal is to use variables within the regex string.

To accomplish this, we can leverage RegExp objects. Instead of employing the traditional /sREGEXs/g syntax, we create a new RegExp object using the following pattern:

let re = new RegExp(String.raw`\s${variable}\s`, "g");

Here, 'variable' represents the string we wish to replace dynamically. The RegExp object effectively contains our regex string with the variable integrated.

To utilize this object, we proceed with the following step:

"mystring1".replace(re, "newstring");

This approach enables the replacement of any instance of the 'variable' with 'newstring' in "mystring1."

In the case of older browsers or Node.js environments, the following alternative can be used:

var re = new RegExp("\s" + variable + "\s", "g");
"mystring1".replace(re, "newstring");

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