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javascript - Regex to replace everything except numbers and a decimal point

I have a text field that needs to remain only text or decimal. Here is the code that I'm currently using to replace everything except numbers and a decimal point. Issue is, I can't figure out a regex that will identify everything else

document.getElementById(target).value = newVal.replace(/D[^.]/g, "");

The D works fine, but I've tried (?!.), (?!.), [^.], [^.] and so on...

Any suggestions for a regular expression that identifies positively with anything except a number or a decimal?

Thanks for the help

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Use this:

document.getElementById(target).value = newVal.replace(/[^0-9.]/g, '');

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