/**
 * lodash 3.0.0 (Custom Build) <https://lodash.com/>
 * Build: `lodash modern modularize exports="npm" -o ./`
 * Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
 * Based on Underscore.js 1.7.0 <http://underscorejs.org/LICENSE>
 * Copyright 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
 * Available under MIT license <https://lodash.com/license>
 */
var baseToString = require('lodash._basetostring');

/**
 * Used to match `RegExp` [special characters](http://www.regular-expressions.info/characters.html#special).
 * In addition to special characters the forward slash is escaped to allow for
 * easier `eval` use and `Function` compilation.
 */
var reRegExpChars = /[.*+?^${}()|[\]\/\\]/g,
    reHasRegExpChars = RegExp(reRegExpChars.source);

/**
 * Escapes the `RegExp` special characters "\", "/", "^", "$", ".", "|", "?",
 * "*", "+", "(", ")", "[", "]", "{" and "}" in `string`.
 *
 * @static
 * @memberOf _
 * @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 = baseToString(string);
  return (string && reHasRegExpChars.test(string))
    ? string.replace(reRegExpChars, '\\$&')
    : string;
}

module.exports = escapeRegExp;