Your escape sequences do not start with a \ like "\u00fd" so you Regex should be only.
Here's a method (based on previous answers) that I wrote to do the job. It handles both \uhhhh and \Uhhhhhhhh, and it will preserve escaped unicode escapes (so if your string needs to contain a literal \uffff, you can do that). The temporary placeholder character \uf00b is in a private use area, so it shouldn't typically occur in Unicode strings.
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