function escapeRegExp(string) {
	      string = baseToString(string);
	      return (string && reHasRegExpChars.test(string))
	        ? string.replace(reRegExpChars, escapeRegExpChar)
	        : (string || '(?:)');
	    }
Escapes the `RegExp` special characters "\", "/", "^", "$", ".", "|", "?",
"*", "+", "(", ")", "[", "]", "{" and "}" in `string`.

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

_.escapeRegExp('[lodash](https://lodash.com/)');
// => '\[lodash\]\(https:\/\/lodash\.com\/\)'