Javascript RegEx String with Variable

Question

I have the following RegEx that works:

var expression = /s\[0\]\[children\]\[.*?\]\[/g;
var replace_string = "s[" + count + "][children][" + subCount + "]";
$input.attr('name', $input.attr('name').replace(expression, replace_string));

Now I am wanting to replace the 0 in the above regex with a variable, "count". I have read up that it needs to be turned into a string, which I have done:

var expression = "/s\\[" + count + "\\]\\[children\\]\\[.*?\\]/g";

But that doesn't want to work for some reason, what am I doing wrong?

Cheers

nucleo_isotope_gallery_filters[0][children][0][preset_referrer] nucleo_isotope_gallery_filters[0][children][1][preset_referrer] nucleo_isotope_gallery_filters[0][children][2][preset_referrer] etc.. — Adam
– Adam, Commented Jun 29, 2015 at 5:21

Avinash Raj · Accepted Answer · 2015-06-29 05:21:37Z

2

You need to use RegExp constructor whenever you want to call a variable from regex.

var expression = new RegExp("s\\[" + count + "\\]\\[children\\]\\[.*?\\]", "g");

answered Jun 29, 2015 at 5:21

Avinash Raj

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