HORIZON PROJECT

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;