Reduce _.escape and _.unescape dependencies

dist/lodash.underscore.js

@@ -26,6 +26,10 @@
       reEvaluate = /<%([\s\S]+?)%>/g,
       reInterpolate = /<%=([\s\S]+?)%>/g;
 
+  /** Used to match HTML entities and HTML characters */
+  var reEscapedHtml = /&(?:amp|lt|gt|quot|#39);/g,
+      reUnescapedHtml = /[&<>"']/g;
+
   /** Used to ensure capturing order of template delimiters */
   var reNoMatch = /($^)/;
 
@@ -43,6 +47,31 @@
       regexpClass = '[object RegExp]',
       stringClass = '[object String]';
 
+  /**
+   * Used to convert characters to HTML entities:
+   *
+   * 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 an unquoted attribute value.
+   * http://mathiasbynens.be/notes/ambiguous-ampersands (under "semi-related fun fact")
+   */
+  var htmlEscapes = {
+    '&': '&amp;',
+    '<': '&lt;',
+    '>': '&gt;',
+    '"': '&quot;',
+    "'": '&#x27;'
+  };
+
+  /** Used to convert HTML entities to characters */
+  var htmlUnescapes = {
+    '&amp;': '&',
+    '&lt;': '<',
+    '&gt;': '>',
+    '&quot;': '"',
+    '&#x27;': "'"
+  };
+
   /** Used to determine if values are of the language type Object */
   var objectTypes = {
     'boolean': false,
@@ -983,29 +1012,6 @@
     return nativeKeys(object);
   };
 
-  /**
-   * Used to convert characters to HTML entities:
-   *
-   * 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 an unquoted attribute value.
-   * http://mathiasbynens.be/notes/ambiguous-ampersands (under "semi-related fun fact")
-   */
-  var htmlEscapes = {
-    '&': '&amp;',
-    '<': '&lt;',
-    '>': '&gt;',
-    '"': '&quot;',
-    "'": '&#x27;'
-  };
-
-  /** Used to convert HTML entities to characters */
-  var htmlUnescapes = invert(htmlEscapes);
-
-  /** Used to match HTML entities and HTML characters */
-  var reEscapedHtml = RegExp('(' + keys(htmlUnescapes).join('|') + ')', 'g'),
-      reUnescapedHtml = RegExp('[' + keys(htmlEscapes).join('') + ']', 'g');
-
   /*--------------------------------------------------------------------------*/
 
   /**