Adam Adam - 1 month ago 10
Javascript Question

Javascript Regex: How to put a variable inside a regular expression?

So for example:

function(input){
var testVar = input;
string = ...
string.replace(/ReGeX + testVar + ReGeX/, "replacement")
}


But this is of course not working :)
Is there any way to do this?

Answer
var regex = new RegExp("ReGeX" + testVar + "ReGeX");
...
string.replace(regex, "replacement");

Update

Per some of the comments, it's important to note that you may want to escape the variable if there is potential for malicious content (e.g. the variable comes from user input)