Brackets and character classes

• Brackets are no longer an enumerated character class

• Brackets are now used for grouping

• Enumerated character class is <[aeiou]> and <-[aeiou]>

• Use '..' instead of '-' for ranges: <[a..z]>

• Whitespace is metasyntactic in character class

<[a e i o u]>   # vowels
<[aeiou]>       # same