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I don't quite understand the ASCII thing
Can somebody explain to me how that works, how do you know which symbols to use? I think Kenneth just supposed everyone knew this and he doesn't elaborate much on that...
Steven Parker217,571 Points
The reference to "ASCII" just means that he's using ordinary characters instead of fancy (unicode) characters. The regex character class shown covers upper case letters (A-Z), lower case letters (a-z), numbers (0-9) and the underscore (_).