6baed57
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=>((a|b|\p{Nd}){1,2}|aaa|bbbb){1,2} bab aaca aaabbbb a0b aa0aaa b0aaa =>(\d{1,3}\.){3}\d{1,3} 1.2.3.4 1.22.333.44 1.2.3 1..2.3
