1.23.1

index.js
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			'use strict';

			var matchOperatorsRe = /[\|\\{}()[\]^$+*?.]/g;

			module.exports = function (str) {
			if (typeof str !== 'string') {
			throw new TypeError('Expected a string');
			}

			return str.replace(matchOperatorsRe, '\\$&');
			};