test/mjsunit/regexp-capture-3.js

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function oneMatch(re) {
  "abcd".replace(re, function() { });
  assertEquals("abcd", RegExp.input);
  assertEquals("a", RegExp.leftContext);
  assertEquals("b", RegExp.lastMatch);
  assertEquals("", RegExp.lastParen);
  assertEquals(undefined, RegExp.lastIndex);
  assertEquals(undefined, RegExp.index);
  assertEquals("cd", RegExp.rightContext);
  for (var i = 1; i < 10; i++) {
    assertEquals("", RegExp['$' + i]);
  }
}

oneMatch(/b/);
oneMatch(/b/g);

"abcdabcd".replace(/b/g, function() { });
assertEquals("abcdabcd", RegExp.input);
assertEquals("abcda", RegExp.leftContext);
assertEquals("b", RegExp.lastMatch);
assertEquals("", RegExp.lastParen);
assertEquals(undefined, RegExp.lastIndex);
assertEquals(undefined, RegExp.index);
assertEquals("cd", RegExp.rightContext);
for (var i = 1; i < 10; i++) {
  assertEquals("", RegExp['$' + i]);
}

function captureMatch(re) {
  "abcd".replace(re, function() { });
  assertEquals("abcd", RegExp.input);
  assertEquals("a", RegExp.leftContext);
  assertEquals("bc", RegExp.lastMatch);
  assertEquals("c", RegExp.lastParen);
  assertEquals(undefined, RegExp.lastIndex);
  assertEquals(undefined, RegExp.index);
  assertEquals("d", RegExp.rightContext);
  assertEquals('b', RegExp.$1);
  assertEquals('c', RegExp.$2);
  for (var i = 3; i < 10; i++) {
    assertEquals("", RegExp['$' + i]);
  }
}

captureMatch(/(b)(c)/);
captureMatch(/(b)(c)/g);

"abcdabcd".replace(/(b)(c)/g, function() { });
assertEquals("abcdabcd", RegExp.input);
assertEquals("abcda", RegExp.leftContext);
assertEquals("bc", RegExp.lastMatch);
assertEquals("c", RegExp.lastParen);
assertEquals(undefined, RegExp.lastIndex);
assertEquals(undefined, RegExp.index);
assertEquals("d", RegExp.rightContext);
assertEquals('b', RegExp.$1);
assertEquals('c', RegExp.$2);
for (var i = 3; i < 10; i++) {
  assertEquals("", RegExp['$' + i]);
}