function unescape(string) {
      if (string == null) {
        return '';
      }
      string = String(string);
      return string.indexOf(';') < 0 ? string : string.replace(reEscapedHtml, unescapeHtmlChar);
    }
The inverse of `_.escape`; this method converts the HTML entities
`&amp;`, `&lt;`, `&gt;`, `&quot;`, and `&#39;` 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_](http://mths.be/he).

@static
@memberOf _
@category Strings
@param {string} string The string to unescape.
@returns {string} Returns the unescaped string.
@example

_.unescape('fred, barney &amp; pebbles');
// => 'fred, barney & pebbles'