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Test for behavior of non-capturing groups, as described in a blog post by Steven Levithan and bug 14931.

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


PASS /(x)?\1y/.test("y") is true
PASS /(x)?\1y/.exec("y") is ["y", undefined]
PASS /(x)?y/.exec("y") is ["y", undefined]
PASS "y".match(/(x)?\1y/) is ["y", undefined]
PASS "y".match(/(x)?y/) is ["y", undefined]
PASS "y".match(/(x)?\1y/g) is ["y"]
PASS "y".split(/(x)?\1y/) is ["", undefined, ""]
PASS "y".split(/(x)?y/) is ["", undefined, ""]
PASS "y".search(/(x)?\1y/) is 0
PASS "y".replace(/(x)?\1y/, "z") is "z"
PASS "y".replace(/(x)?y/, "$1") is ""
PASS "y".replace(/(x)?\1y/, function($0, $1){ return String($1); }) is "undefined"
PASS "y".replace(/(x)?y/, function($0, $1){ return String($1); }) is "undefined"
PASS "y".replace(/(x)?y/, function($0, $1){ return $1; }) is "undefined"
PASS successfullyParsed is true

TEST COMPLETE