1 =>((a|b|\p{Nd}){1,2}|aaa|bbbb){1,2} 2 bab 3 aaca 4 aaabbbb 5 a0b 6 aa0aaa 7 b0aaa 8 =>(\d{1,3}\.){3}\d{1,3} 9 1.2.3.4 10 1.22.333.44 11 1.2.3 12 1..2.3 13
