It depends on its use, ultimately, but if your goal is to find a string of letters (a common use IMO), you'll want to use something like \p{L} to ensure you don

It depends on its use, ultimately, but if your goal is to find a string of letters (a common use IMO), you'll want to use something like \p{L} to ensure you don't miss non-ASCII characters. eta: fixed regex, I had typed \L, shared from my faulty memory.