var toString = require('./toString'),

unescapeHtmlChar = require('./_unescapeHtmlChar');

/** Used to match HTML entities and HTML characters. */ var reEscapedHtml = /&(?:amp|lt|gt|quot|#39);/g,

reHasEscapedHtml = RegExp(reEscapedHtml.source);

/**

* The inverse of `_.escape`; this method converts the HTML entities
* `&`, `<`, `>`, `"`, and `'` in `string` to
* their corresponding characters.
*
* **Note:** No other HTML entities are unescaped. To unescape additional
* HTML entities use a third-party library like [_he_](https://mths.be/he).
*
* @static
* @memberOf _
* @since 0.6.0
* @category String
* @param {string} [string=''] The string to unescape.
* @returns {string} Returns the unescaped string.
* @example
*
* _.unescape('fred, barney, & pebbles');
* // => 'fred, barney, & pebbles'
*/

function unescape(string) {

string = toString(string);
return (string && reHasEscapedHtml.test(string))
  ? string.replace(reEscapedHtml, unescapeHtmlChar)
  : string;

}

module.exports = unescape;