1[abc]a, b, or c (simple class)

2[^abc]Any character except a, b, or c (negation)

3[a-zA-Z]a through z or A through Z, inclusive (range)

4[a-d[m-p]]a through d, or m through p: [a-dm-p] (union)

5[a-z&&[def]]d, e, or f (intersection)

6[a-z&&[^bc]]a through z, except for b and c: [ad-z] (subtraction)

7[a-z&&[^m-p]]a through z, and not m through p: [a-lq-z](subtraction)

X? X, once or not at all

X* X, zero or more times

X+ X, one or more times

X{n} X, exactly n times

X{n,} X, at least n times

X{n,m} X, at least n but not more than m times

Reluctant quantifiers

X?? X, once or not at all

X*? X, zero or more times

X+? X, one or more times

X{n}? X, exactly n times

X{n,}? X, at least n times

X{n,m}? X, at least n but not more than m times

Possessive quantifiers

X?+ X, once or not at all

X*+ X, zero or more times

X++ X, one or more times

X{n}+ X, exactly n times

X{n,}+ X, at least n times

X{n,m}+ X, at least n but not more than m times

To Split the String…