v8/test/mjsunit/es6/regexp-sticky.js

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var re = /foo.bar/;

assertTrue(!!"foo*bar".match(re));
assertTrue(!!"..foo*bar".match(re));

var plain = /foobar/;

assertTrue(!!"foobar".match(plain));
assertTrue(!!"..foobar".match(plain));

var sticky = /foo.bar/y;

assertTrue(!!"foo*bar".match(sticky));
assertEquals(7, sticky.lastIndex);
assertFalse(!!"..foo*bar".match(sticky));

var stickyplain = /foobar/y;

assertTrue(!!"foobarfoobar".match(stickyplain));
assertEquals(6, stickyplain.lastIndex);
assertTrue(!!"foobarfoobar".match(stickyplain));
assertEquals(12, stickyplain.lastIndex);
assertFalse(!!"..foobarfoobar".match(stickyplain));

var global = /foo.bar/g;

assertTrue(global.test("foo*bar"));
assertFalse(global.test("..foo*bar"));
global.lastIndex = 0;
assertTrue(global.test("..foo*bar"));

var plainglobal = /foobar/g;

assertTrue(plainglobal.test("foobar"));
assertFalse(plainglobal.test("foobar"));
plainglobal.lastIndex = 0;
assertTrue(plainglobal.test("foobar"));

var stickyglobal = /foo.bar/gy;

assertTrue(stickyglobal.test("foo*bar"));
assertEquals(7, stickyglobal.lastIndex);
assertFalse(stickyglobal.test("..foo*bar"));
stickyglobal.lastIndex = 0;
assertFalse(stickyglobal.test("..foo*bar"));
stickyglobal.lastIndex = 2;
assertTrue(stickyglobal.test("..foo*bar"));
assertEquals(9, stickyglobal.lastIndex);

var stickyplainglobal = /foobar/yg;
assertTrue(stickyplainglobal.sticky);
stickyplainglobal.sticky = false;

assertTrue(stickyplainglobal.test("foobar"));
assertEquals(6, stickyplainglobal.lastIndex);
assertFalse(stickyplainglobal.test("..foobar"));
stickyplainglobal.lastIndex = 0;
assertFalse(stickyplainglobal.test("..foobar"));
stickyplainglobal.lastIndex = 2;
assertTrue(stickyplainglobal.test("..foobar"));
assertEquals(8, stickyplainglobal.lastIndex);

assertEquals("/foo.bar/gy", "" + stickyglobal);
assertEquals("/foo.bar/g", "" + global);

assertTrue(stickyglobal.sticky);
stickyglobal.sticky = false;
assertTrue(stickyglobal.sticky);

var stickyglobal2 = new RegExp("foo.bar", "gy");
assertTrue(stickyglobal2.test("foo*bar"));
assertEquals(7, stickyglobal2.lastIndex);
assertFalse(stickyglobal2.test("..foo*bar"));
stickyglobal2.lastIndex = 0;
assertFalse(stickyglobal2.test("..foo*bar"));
stickyglobal2.lastIndex = 2;
assertTrue(stickyglobal2.test("..foo*bar"));
assertEquals(9, stickyglobal2.lastIndex);

assertEquals("/foo.bar/gy", "" + stickyglobal2);

assertTrue(stickyglobal2.sticky);
stickyglobal2.sticky = false;
assertTrue(stickyglobal2.sticky);

sticky.lastIndex = -1; // Causes sticky regexp to fail fast
assertFalse(sticky.test("..foo.bar"));
assertEquals(0, sticky.lastIndex);

sticky.lastIndex = -1; // Causes sticky regexp to fail fast
assertFalse(!!sticky.exec("..foo.bar"));
assertEquals(0, sticky.lastIndex);

// ES6 draft says: Even when the y flag is used with a pattern, ^ always
// matches only at the beginning of Input, or (if Multiline is true) at the
// beginning of a line.
var hat = /^foo/y;
hat.lastIndex = 2;
assertFalse(hat.test("..foo"));

var mhat = /^foo/my;
mhat.lastIndex = 2;
assertFalse(mhat.test("..foo"));
mhat.lastIndex = 2;
assertTrue(mhat.test(".\nfoo"));

// Check that we don't apply incorrect optimization to sticky regexps that
// are anchored at end.
var stickyanchored = /bar$/y;
assertFalse(stickyanchored.test("foobar"));
stickyanchored.lastIndex = 3;
assertTrue(stickyanchored.test("foobar"));