Regexp: ((a|b|\p{Nd}){1,2}|aaa|bbbb){1,2} bab: Ok aaca: Fail aaabbbb: Ok a0b: Ok aa0aaa: Fail b0aaa: Ok Regexp: (\d{1,3}\.){3}\d{1,3} 1.2.3.4: Ok 1.22.333.44: Ok 1.2.3: Fail 1..2.3: Fail
