test/mjsunit/regress/regress-1217.js

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// Check that RegExp.prototype is itself a RegExp object.

var proto = RegExp.prototype;
assertEquals("[object RegExp]", Object.prototype.toString.call(proto));

assertEquals("(?:)", proto.source);
assertEquals(false, proto.global);
assertEquals(false, proto.multiline);
assertEquals(false, proto.ignoreCase);
assertEquals(0, proto.lastIndex);

assertEquals("/(?:)/", proto.toString());

var execResult = proto.exec("argle");
assertEquals(1, execResult.length);
assertEquals("", execResult[0]);
assertEquals("argle", execResult.input);
assertEquals(0, execResult.index);

assertTrue(proto.test("argle"));

// We disallow re-compiling the RegExp.prototype object.
assertThrows(function(){ proto.compile("something"); }, TypeError);