How to use a variable inside a RegEx pattern?

2018-06-27 11:33:38

This question already has an answer here:

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

Use new RegExp(string) to build a regular expression dynamically. The literal /../ form cannot be used with dynamic content.

Make sure to have a valid pattern after building the string.

var len = 99;
var re = new RegExp(".(?=.{" + len + "})", "g");
var output = input.replace(re, "*")

Also see (and vote for dupe of):

How do you use a variable in a regular expression?

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