Hide red dots showing in xml content

The content in codemirror textarea shows red dots between albhabets. How can I get rid of this?

These indicate non-printing characters in the input string. You can hover over them to see which character. If you clean up your input data by removing such characters, CodeMirror won’t show them.

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It is showing the character \u0 charcter. How can I replace that?
I tried xmlString.replace(’\u0000’, ‘’) but failed

If you give replace a string as first arg, it’ll only replace a single instance. xmlString.replace(/\0/g, '') should work