Simplify _.escapeRegExp to align with the defunct ES7 proposal.

lodash.js

@@ -94,10 +94,9 @@
       rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\n\\]|\\.)*?)\2)\]/g;
 
   /**
-   * Used to match `RegExp` [syntax characters](http://ecma-international.org/ecma-262/6.0/#sec-patterns)
-   * and those outlined by [`EscapeRegExpPattern`](http://ecma-international.org/ecma-262/6.0/#sec-escaperegexppattern).
+   * Used to match `RegExp` [syntax characters](http://ecma-international.org/ecma-262/6.0/#sec-patterns).
    */
-  var reRegExpChars = /^[:!,]|[\\^$.*+?()[\]{}|\/]|(^[0-9a-fA-Fnrtuvx])|([\n\r\u2028\u2029])/g,
+  var reRegExpChars = /[\\^$.*+?()[\]{}|]/g,
       reHasRegExpChars = RegExp(reRegExpChars.source);
 
   /** Used to match [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks). */
@@ -9805,8 +9804,8 @@
     }
 
     /**
-     * Escapes the `RegExp` special characters "\", "/", "^", "$", ".", "|", "?",
-     * "*", "+", "(", ")", "[", "]", "{" and "}" in `string`.
+     * Escapes the `RegExp` special characters "^", "$", "\", ".", "*", "+",
+     * "?", "(", ")", "[", "]", "{", "}", and "|" in `string`.
      *
      * @static
      * @memberOf _
@@ -9816,13 +9815,13 @@
      * @example
      *
      * _.escapeRegExp('[lodash](https://lodash.com/)');
-     * // => '\[lodash\]\(https:\/\/lodash\.com\/\)'
+     * // => '\[lodash\]\(https://lodash\.com/\)'
      */
     function escapeRegExp(string) {
       string = baseToString(string);
       return (string && reHasRegExpChars.test(string))
-        ? string.replace(reRegExpChars, escapeRegExpChar)
-        : (string || '(?:)');
+        ? string.replace(reRegExpChars, '\\$&')
+        : string;
     }
 
     /**