Oh totally. I assumed that unicode bs immediately. And anyone would make this mistake easily. That's the point -- gotta have it imprinted in the brains, that regexes are for finding things in files, not for your production code.
I've used them myself, but I'd like to think that when i type that regex in i stop and thing whether i will be feeding raw user inputs into it.
Compressing multiple forms of non-unicode whitespace to single space. Used for cleaning text from input fields that often contains unwanted characters from copy/paste.
