BUPKIS
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    Variable regexpAssertionConst

    regexpAssertion: AssertionStandardSchemaSync<
        readonly [
            readonly ["to be a RegExp", "to be a regex", "to be a regexp"],
        ],
        ZodCustom<RegExp, RegExp>,
        never,
    > = ...

    Asserts that the subject is a regular expression.

    expect(/test/, 'to be a RegExp'); // passes
    expect('test', 'to be a RegExp'); // fails