问题
I had this problem today:
This regex matches only English: [a-zA-Z0-9].
If I need support for any language in this world, what regex should I write?
回答1:
If you use character class shorthands and a Unicode aware regex engine you can do that. The \w class matches "word characters" (letters, digits, and underscores).
Beware of some regex flavors that don't do this so well: JavaScript uses ASCII for \d (digits) and \w, but Unicode for \s (whitespace). XML does it the other way around.
来源：https://stackoverflow.com/questions/6692540/how-can-i-create-an-alphanumeric-regex-for-all-languages