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It seems like it's an error within OpenCV and "regular expression" suggests it's an issue with their string parsing using reg exp. I'd suggest trying to install the latest version of CMake, checking your cmake error logs - which will be shown in your console (or gui console). This will prompt you towards what the error might be, although they can be fairly roundabout as to what the actual issue might be!
Basically, with their regular expression finder, it seems like there are a number of special characters i.e. + ' / etc. which it fails to handle.
