From type/Test

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multi sub unlike(Str() $got, Regex:D $expected, $desc = "text does not match $expected.raku()")

Used this way:

unlike 'foo', /bar/, 'foo does not look like bar';

Marks a test as passed if the first parameter, when coerced to a string, does not match the regular expression specified as the second parameter. The function accepts an optional description of the test, which defaults to printing the text that did not match.