src/third_party/mozjs-45/js/src/jit-test/tests/basic/regexp-reset-input.js

var re = /(pattern)/g;
var input = "patternpatternpattern";
re.exec(input)
RegExp.input = "satturn";
assertEq(RegExp.$1, "pattern");
assertEq(RegExp.lastMatch, "pattern");
assertEq(RegExp.lastParen, "pattern");
assertEq(RegExp.rightContext, "patternpattern");