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index.js « escape-string-regexp « node_modules - github.com/npm/cli.git - Unnamed repository; edit this file 'description' to name the repository.
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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,  '\\$&');
};