How can I replace a regex substring match in Javascript?

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var str   = 'asd-0.testing';
var regex = /asd-(\d)\.\w+/;

str.replace(regex, 1);

That replaces the entire string str with 1. I want it to replace the matched substring instead of the whole string. Is this possible in Javascript?

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How can I replace a regex substring match in Javascript?

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