function unescape(string) {
      string = string == null ? '' : String(string);
      return string && (reEscapedHtml.lastIndex = 0, reEscapedHtml.test(string))
        ? string.replace(reEscapedHtml, unescapeHtmlChar)
        : string;
    }
The inverse of `_.escape`; this method converts the HTML entities
`&amp;`, `&lt;`, `&gt;`, `&quot;`, `&#39;`, and `&#96;` 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 String
@param {string} [string=''] The string to unescape.
@returns {string} Returns the unescaped string.
@example

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