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var toString = require('./toString');
/** * Used to match `RegExp` * [syntax characters](http://ecma-international.org/ecma-262/7.0/#sec-patterns). */var reRegExpChar = /[\\^$.*+?()[\]{}|]/g,    reHasRegExpChar = RegExp(reRegExpChar.source);
/** * Escapes the `RegExp` special characters "^", "$", "\", ".", "*", "+", * "?", "(", ")", "[", "]", "{", "}", and "|" in `string`. * * @static * @memberOf _ * @since 3.0.0 * @category String * @param {string} [string=''] The string to escape. * @returns {string} Returns the escaped string. * @example * * _.escapeRegExp('[lodash](https://lodash.com/)'); * // => '\[lodash\]\(https://lodash\.com/\)' */function escapeRegExp(string) {  string = toString(string);  return (string && reHasRegExpChar.test(string))    ? string.replace(reRegExpChar, '\\$&')    : string;}
module.exports = escapeRegExp;