Globs

*.foo
?.bar
[A-Z]*.baz

extglob

# set
shopt -s extglob
# unset
shopt -u extglob
# check
shopt -p extglob

?(pattern-list) : Matches zero or one occurrence of the given patterns
*(pattern-list) : Matches zero or more occurrences of the given patterns
+(pattern-list) : Matches one or more occurrences of the given patterns
@(pattern-list) : Matches one of the given patterns
!(pattern-list) : Matches anything except one of the given patterns