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sausage/userland/goawk/source/testdata/t.re1a
T

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BEGIN { r1 = "[a-cg-j1-3]"
r2 = "[^aeiou]"
}
$0 ~ r1 { print $0 " matches /[a-cg-j1-3]/" }
$0 ~ r2 { print $0 " matches /[^aeiou]/" }