diff --git a/lib/ace/layer/text.js b/lib/ace/layer/text.js
index d4d39bc0..e4069659 100644
--- a/lib/ace/layer/text.js
+++ b/lib/ace/layer/text.js
@@ -390,21 +390,18 @@ var Text = function(parentEl) {
 
     this.$renderToken = function(stringBuilder, screenColumn, token, value) {        
         var self = this;
-        var replaceReg = /\t|&|<|( +)|([\v\f \u00a0\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u200b\u2028\u2029\u3000])|[\u1100-\u115F]|[\u11A3-\u11A7]|[\u11FA-\u11FF]|[\u2329-\u232A]|[\u2E80-\u2E99]|[\u2E9B-\u2EF3]|[\u2F00-\u2FD5]|[\u2FF0-\u2FFB]|[\u3000-\u303E]|[\u3041-\u3096]|[\u3099-\u30FF]|[\u3105-\u312D]|[\u3131-\u318E]|[\u3190-\u31BA]|[\u31C0-\u31E3]|[\u31F0-\u321E]|[\u3220-\u3247]|[\u3250-\u32FE]|[\u3300-\u4DBF]|[\u4E00-\uA48C]|[\uA490-\uA4C6]|[\uA960-\uA97C]|[\uAC00-\uD7A3]|[\uD7B0-\uD7C6]|[\uD7CB-\uD7FB]|[\uF900-\uFAFF]|[\uFE10-\uFE19]|[\uFE30-\uFE52]|[\uFE54-\uFE66]|[\uFE68-\uFE6B]|[\uFF01-\uFF60]|[\uFFE0-\uFFE6]/g;
+        var replaceReg = /\t|&|<|( +)|([\u0000-\u0019\u00a0\u2000-\u200b\u2028\u2029\u3000])|[\u1100-\u115F\u11A3-\u11A7\u11FA-\u11FF\u2329-\u232A\u2E80-\u2E99\u2E9B-\u2EF3\u2F00-\u2FD5\u2FF0-\u2FFB\u3000-\u303E\u3041-\u3096\u3099-\u30FF\u3105-\u312D\u3131-\u318E\u3190-\u31BA\u31C0-\u31E3\u31F0-\u321E\u3220-\u3247\u3250-\u32FE\u3300-\u4DBF\u4E00-\uA48C\uA490-\uA4C6\uA960-\uA97C\uAC00-\uD7A3\uD7B0-\uD7C6\uD7CB-\uD7FB\uF900-\uFAFF\uFE10-\uFE19\uFE30-\uFE52\uFE54-\uFE66\uFE68-\uFE6B\uFF01-\uFF60\uFFE0-\uFFE6]/g;
         var replaceFunc = function(c, a, b, tabIdx, idx4) {
-            if (c.charCodeAt(0) == 32) {
+            if (a) {
                 return new Array(c.length+1).join("&#160;");
+            } else if (c == "&") {
+                return useragent.isOldGecko ? "&" : "&amp;";
+            } else if (c == "<") {
+                return "&lt;";
             } else if (c == "\t") {
                 var tabSize = self.session.getScreenTabSize(screenColumn + tabIdx);
                 screenColumn += tabSize - 1;
                 return self.$tabStrings[tabSize];
-            } else if (c == "&") {
-                if (useragent.isOldGecko)
-                    return "&";
-                else
-                    return "&amp;";
-            } else if (c == "<") {
-                return "&lt;";
             } else if (c == "\u3000") {
                 // U+3000 is both invisible AND full-width, so must be handled uniquely
                 var classToUse = self.showInvisibles ? "ace_cjk ace_invisible" : "ace_cjk";
@@ -413,13 +410,11 @@ var Text = function(parentEl) {
                 return "<span class='" + classToUse + "' style='width:" +
                     (self.config.characterWidth * 2) +
                     "px'>" + space + "</span>";
-            } else if (c.match(/[\v\f \u00a0\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u200b\u2028\u2029\u3000]/)) {
-                if (self.showInvisibles) {
-                    var space = new Array(c.length+1).join(self.SPACE_CHAR);
-                    return "<span class='ace_invisible'>" + space + "</span>";
-                } else {
+            } else if (b) {
+                if (self.showInvisibles)
+                    return "<span class='ace_invisible ace_invalid'>" + self.SPACE_CHAR + "</span>";
+                else
                     return "&#160;";
-                }
             } else {
                 screenColumn += 1;
                 return "<span class='ace_cjk' style='width:" +