Find and Replace with regex replaces text literally

I often use regular expressions in Find and Replace to add non-breaking spaces before symbols €, %, mg, ml... I've always used the same formula, but now it's replacing the text literally.

Find: ([0-9]) (%)
Replace: $1 $2
Use regular expressions checked.

And it will replace 5 % with $1 $2 (with a non-breaking space).

It's always worked before, why isn't it working now. Is it a bug? I'm using Studio 2019 SR1.

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