Javascript: search and replace once

I am trying to do a regex search and replace but only the first one...

var str = "[0][ref]";
var res = str.replace(/\[(.+?)\]/g, "[1]");

I want it to output: "[1][ref]"

Any ideas?
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Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
try replace:

var res = str.replace(/\[(.+?)\]/g, "[1]");


var res = str.replace(/\[(.+?)\]/, "[1]");

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Julian HansenCommented:
<script type="text/javascript">
var str = "[0][ref]";
var res = str.replace(/\[\d\]/, "[1]");
console.log('res: ' +res);

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maccaj51Author Commented:
Many thanks
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