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rOACCT/node_modules/core-js/internals/regexp-sticky-helpers.js
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regexp-sticky-helpers.js
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			var fails = require('../internals/fails');
			var global = require('../internals/global');

			// babel-minify and Closure Compiler transpiles RegExp('a', 'y') -> /a/y and it causes SyntaxError
			var $RegExp = global.RegExp;

			var UNSUPPORTED_Y = fails(function () {
			var re = $RegExp('a', 'y');
			re.lastIndex = 2;
			return re.exec('abcd') != null;
			});

			// UC Browser bug
			// https://github.com/zloirock/core-js/issues/1008
			var MISSED_STICKY = UNSUPPORTED_Y \|\| fails(function () {
			return !$RegExp('a', 'y').sticky;
			});

			var BROKEN_CARET = UNSUPPORTED_Y \|\| fails(function () {
			// https://bugzilla.mozilla.org/show_bug.cgi?id=773687
			var re = $RegExp('^r', 'gy');
			re.lastIndex = 2;
			return re.exec('str') != null;
			});

			module.exports = {
			BROKEN_CARET: BROKEN_CARET,
			MISSED_STICKY: MISSED_STICKY,
			UNSUPPORTED_Y: UNSUPPORTED_Y
			};