Remove space fails in Studio

Every now and then I try to remove a space or non-breaking space via a regex. Unfortunately it does not work in Studio. Why? It works in .Net. Can this be repaired?

Here is an example: I try to remove the space between +/- and a number (eg. + 23 % should be +23 %)

Regex: (?<!\d\s?)([\+-])\s(\d)

Replace with: $1$2

See http://regexstorm.net/tester?p=%28%3f%3c!%5cd%5cs%3f%29%5c%2b%5cs%28%5cd%29&i=ca+4+%2b+3%2c56+%3d%0d%0a%28%2b+45+%25%29%0d%0aca.+%2b+68%0d%0a6%2b+99+%3d+105&r=%2b%241

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