javascript - how do i escape a variable in this regex -


please see following: https://regex101.com/r/gg3eo8/1

what want instead of using constant string, in case 'i'm h1', want insert variable there value dynamic, following tried guess i'm not escaping properly

var value = "random string"; "/<h1>.*?" + value + ".*?<\/h1>/g"

what right way escape above?

use regexp constructor.

if (!regexp.escape) {     regexp.escape = function (value) {         return value.replace(/\w/g, "\\$&")     }; } var reg = new regexp("<h1>.*?" + regexp.escape(value) + ".*?</h1>", "g");

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