function escape(string) {
    // Reset `lastIndex` because in IE < 9 `String#replace` does not.
    string = baseToString(string);
    return (string && reHasUnescapedHtml.test(string))
      ? string.replace(reUnescapedHtml, escapeHtmlChar)
      : string;
  }
Converts the characters "&", "<", ">", '"', "'", and "\`", in `string` to
their corresponding HTML entities.

**Note:** No other characters are escaped. To escape additional characters
use a third-party library like [_he_](https://mths.be/he).

Though the ">" character is escaped for symmetry, characters like
">" and "/" don't require escaping in HTML and have no special meaning
unless they're part of a tag or unquoted attribute value.
See [Mathias Bynens's article](https://mathiasbynens.be/notes/ambiguous-ampersands)
(under "semi-related fun fact") for more details.

Backticks are escaped because in Internet Explorer < 9, they can break out
of attribute values or HTML comments. See [#102](https://html5sec.org/#102),
[#108](https://html5sec.org/#108), and [#133](https://html5sec.org/#133) of
the [HTML5 Security Cheatsheet](https://html5sec.org/) for more details.

When working with HTML you should always quote attribute values to reduce
XSS vectors. See [Ryan Grove's article](http://wonko.com/post/html-escaping)
for more details.

@static
@memberOf _
@category String
@param {string} [string=''] The string to escape.
@returns {string} Returns the escaped string.
@example

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