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BEGIN { r1 = "xxx"
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r2 = "xxx" ":"
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r3 = ":" r2
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r4 = "a"
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}
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$0 ~ r1 { print $0 " matches " r1 }
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$0 ~ r2 { print $0 " matches " r2 }
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$0 ~ r3 { print $0 " matches " r3 }
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$0 ~ r4 { print $0 " matches " r4 }
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