Match a single character present in the list below [6-9] 6-9 matches a single character in the range between 6 (index 54) and 9 (index 57) (case sensitive) Match a single character present in the list below [0-9] {9} matches the previous token exactly 9 times 0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)