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