diff --git a/change_log.txt b/change_log.txt
index 83b63a2a..da9e9b4b 100644
--- a/change_log.txt
+++ b/change_log.txt
@@ -1,4 +1,7 @@
 ===== trunk  =====
+06.10.2011
+- bugfix switch lexer internals depending on mbstring.func_overload
+
 05.10.2011
 - bugfix of problem introduced with r4342 by replacing strlen() with isset()
 - add environment configuration issue with mbstring.func_overload Smarty cannot compensate for (Issue #45)
diff --git a/libs/Smarty.class.php b/libs/Smarty.class.php
index 10affa91..8060f3b9 100644
--- a/libs/Smarty.class.php
+++ b/libs/Smarty.class.php
@@ -57,9 +57,6 @@ if (!defined('SMARTY_PLUGINS_DIR')) {
     define('SMARTY_PLUGINS_DIR', SMARTY_DIR . 'plugins' . DS);
 }
 if (!defined('SMARTY_MBSTRING')) {
-    if (ini_get('mbstring.func_overload') & 2) {
-        throw new SmartyException("mbstring.func_overload is active which breaks Smarty's compiler.");
-    }
     define('SMARTY_MBSTRING', function_exists('mb_strlen'));
 }
 if (!defined('SMARTY_RESOURCE_CHAR_SET')) {
diff --git a/libs/sysplugins/smarty_internal_configfilelexer.php b/libs/sysplugins/smarty_internal_configfilelexer.php
index 9180aecf..20156ae8 100644
--- a/libs/sysplugins/smarty_internal_configfilelexer.php
+++ b/libs/sysplugins/smarty_internal_configfilelexer.php
@@ -32,7 +32,8 @@ class Smarty_Internal_Configfilelexer
         $this->counter = 0;
         $this->line = 1;
         $this->smarty = $smarty;
-     }
+        $this->mbstring_overload = ini_get('mbstring.func_overload') & 2;
+    }
     public static function &instance($new_instance = null)
     {
         static $instance = null;
@@ -87,7 +88,7 @@ class Smarty_Internal_Configfilelexer
         $yy_global_pattern = "/\G(#|;)|\G(\\[)|\G(\\])|\G(=)|\G([ \t\r]+)|\G(\n)|\G([0-9]*[a-zA-Z_]\\w*)/iS";
 
         do {
-            if (preg_match($yy_global_pattern,$this->data, $yymatches, null, $this->counter)) {
+            if ($this->mbstring_overload ? preg_match($yy_global_pattern, substr($this->data, $this->counter), $yymatches) : preg_match($yy_global_pattern,$this->data, $yymatches, null, $this->counter)) {
                 $yysubmatches = $yymatches;
                 $yymatches = array_filter($yymatches, 'strlen'); // remove empty sub-patterns
                 if (!count($yymatches)) {
@@ -194,7 +195,7 @@ class Smarty_Internal_Configfilelexer
         $yy_global_pattern = "/\G([ \t\r]+)|\G(\\d+\\.\\d+(?=[ \t\r]*[\n#;]))|\G(\\d+(?=[ \t\r]*[\n#;]))|\G('[^'\\\\]*(?:\\\\.[^'\\\\]*)*'(?=[ \t\r]*[\n#;]))|\G(\"[^\"\\\\]*(?:\\\\.[^\"\\\\]*)*\"(?=[ \t\r]*[\n#;]))|\G(\"\"\"([^\"]|\\\\\"|\"{1,2}[^\"])*\"\"\"(?=[ \t\r]*[\n#;]))|\G([a-zA-Z]+(?=[ \t\r]*[\n#;]))|\G([^\n]+?(?=[ \t\r]*\n))|\G(\n)/iS";
 
         do {
-            if (preg_match($yy_global_pattern,$this->data, $yymatches, null, $this->counter)) {
+            if ($this->mbstring_overload ? preg_match($yy_global_pattern, substr($this->data, $this->counter), $yymatches) : preg_match($yy_global_pattern,$this->data, $yymatches, null, $this->counter)) {
                 $yysubmatches = $yymatches;
                 $yymatches = array_filter($yymatches, 'strlen'); // remove empty sub-patterns
                 if (!count($yymatches)) {
@@ -315,7 +316,7 @@ class Smarty_Internal_Configfilelexer
         $yy_global_pattern = "/\G([^\n]+?(?=[ \t\r]*\n))/iS";
 
         do {
-            if (preg_match($yy_global_pattern,$this->data, $yymatches, null, $this->counter)) {
+            if ($this->mbstring_overload ? preg_match($yy_global_pattern, substr($this->data, $this->counter), $yymatches) : preg_match($yy_global_pattern,$this->data, $yymatches, null, $this->counter)) {
                 $yysubmatches = $yymatches;
                 $yymatches = array_filter($yymatches, 'strlen'); // remove empty sub-patterns
                 if (!count($yymatches)) {
@@ -384,7 +385,7 @@ class Smarty_Internal_Configfilelexer
         $yy_global_pattern = "/\G([ \t\r]+)|\G([^\n]+?(?=[ \t\r]*\n))|\G(\n)/iS";
 
         do {
-            if (preg_match($yy_global_pattern,$this->data, $yymatches, null, $this->counter)) {
+            if ($this->mbstring_overload ? preg_match($yy_global_pattern, substr($this->data, $this->counter), $yymatches) : preg_match($yy_global_pattern,$this->data, $yymatches, null, $this->counter)) {
                 $yysubmatches = $yymatches;
                 $yymatches = array_filter($yymatches, 'strlen'); // remove empty sub-patterns
                 if (!count($yymatches)) {
@@ -462,7 +463,7 @@ class Smarty_Internal_Configfilelexer
         $yy_global_pattern = "/\G(\\.)|\G(.*?(?=[\.=[\]\r\n]))/iS";
 
         do {
-            if (preg_match($yy_global_pattern,$this->data, $yymatches, null, $this->counter)) {
+            if ($this->mbstring_overload ? preg_match($yy_global_pattern, substr($this->data, $this->counter), $yymatches) : preg_match($yy_global_pattern,$this->data, $yymatches, null, $this->counter)) {
                 $yysubmatches = $yymatches;
                 $yymatches = array_filter($yymatches, 'strlen'); // remove empty sub-patterns
                 if (!count($yymatches)) {
diff --git a/libs/sysplugins/smarty_internal_templatelexer.php b/libs/sysplugins/smarty_internal_templatelexer.php
index a3bc0b15..131153da 100644
--- a/libs/sysplugins/smarty_internal_templatelexer.php
+++ b/libs/sysplugins/smarty_internal_templatelexer.php
@@ -89,6 +89,7 @@ class Smarty_Internal_Templatelexer
         $this->rdel = preg_quote($this->smarty->right_delimiter,'/');
         $this->smarty_token_names['LDEL'] =	$this->smarty->left_delimiter;
         $this->smarty_token_names['RDEL'] =	$this->smarty->right_delimiter;
+        $this->mbstring_overload = ini_get('mbstring.func_overload') & 2;
      }
 
 
@@ -152,7 +153,7 @@ class Smarty_Internal_Templatelexer
         $yy_global_pattern = "/\G(".$this->ldel."[$]smarty\\.block\\.child".$this->rdel.")|\G(\\{\\})|\G(".$this->ldel."\\*([\S\s]*?)\\*".$this->rdel.")|\G([\t ]*[\r\n]+[\t ]*)|\G(".$this->ldel."strip".$this->rdel.")|\G(".$this->ldel."\\s{1,}strip\\s{1,}".$this->rdel.")|\G(".$this->ldel."\/strip".$this->rdel.")|\G(".$this->ldel."\\s{1,}\/strip\\s{1,}".$this->rdel.")|\G(".$this->ldel."\\s*literal\\s*".$this->rdel.")|\G(".$this->ldel."\\s{1,}\/)|\G(".$this->ldel."\\s*(if|elseif|else if|while)\\s+)|\G(".$this->ldel."\\s*for\\s+)|\G(".$this->ldel."\\s*foreach(?![^\s]))|\G(".$this->ldel."\\s*setfilter\\s+)|\G(".$this->ldel."\\s{1,})|\G(".$this->ldel."\/)|\G(".$this->ldel.")|\G(<\\?(?:php\\w+|=|[a-zA-Z]+)?)|\G(\\?>)|\G(<%)|\G(%>)|\G(([\S\s]*?)(?=([\t ]*[\r\n]+[\t ]*|".$this->ldel."|<\\?|\\?>|<%|%>)))|\G([\S\s]+)|\G(.)/iS";
 
         do {
-            if (preg_match($yy_global_pattern,$this->data, $yymatches, null, $this->counter)) {
+            if ($this->mbstring_overload ? preg_match($yy_global_pattern, substr($this->data, $this->counter), $yymatches) : preg_match($yy_global_pattern,$this->data, $yymatches, null, $this->counter)) {
                 $yysubmatches = $yymatches;
                 $yymatches = array_filter($yymatches, 'strlen'); // remove empty sub-patterns
                 if (!count($yymatches)) {
@@ -462,7 +463,7 @@ class Smarty_Internal_Templatelexer
         $yy_global_pattern = "/\G('[^'\\\\]*(?:\\\\.[^'\\\\]*)*')|\G(".$this->ldel."\\s{1,}\/)|\G(".$this->ldel."\\s*(if|elseif|else if|while)\\s+)|\G(".$this->ldel."\\s*for\\s+)|\G(".$this->ldel."\\s*foreach(?![^\s]))|\G(".$this->ldel."\\s{1,})|\G(\\s{1,}".$this->rdel.")|\G(".$this->ldel."\/)|\G(".$this->ldel.")|\G(".$this->rdel.")|\G(\\s+is\\s+in\\s+)|\G(\\s+as\\s+)|\G(\\s+to\\s+)|\G(\\s+step\\s+)|\G(\\s+instanceof\\s+)|\G(\\s*===\\s*)|\G(\\s*!==\\s*)|\G(\\s*==\\s*|\\s+eq\\s+)|\G(\\s*!=\\s*|\\s*<>\\s*|\\s+(ne|neq)\\s+)|\G(\\s*>=\\s*|\\s+(ge|gte)\\s+)|\G(\\s*<=\\s*|\\s+(le|lte)\\s+)|\G(\\s*>\\s*|\\s+gt\\s+)|\G(\\s*<\\s*|\\s+lt\\s+)|\G(\\s+mod\\s+)|\G(!\\s*|not\\s+)|\G(\\s*&&\\s*|\\s*and\\s+)|\G(\\s*\\|\\|\\s*|\\s*or\\s+)|\G(\\s*xor\\s+)|\G(\\s+is\\s+odd\\s+by\\s+)|\G(\\s+is\\s+not\\s+odd\\s+by\\s+)|\G(\\s+is\\s+odd)|\G(\\s+is\\s+not\\s+odd)|\G(\\s+is\\s+even\\s+by\\s+)|\G(\\s+is\\s+not\\s+even\\s+by\\s+)|\G(\\s+is\\s+even)|\G(\\s+is\\s+not\\s+even)|\G(\\s+is\\s+div\\s+by\\s+)|\G(\\s+is\\s+not\\s+div\\s+by\\s+)|\G(\\((int(eger)?|bool(ean)?|float|double|real|string|binary|array|object)\\)\\s*)|\G(\\(\\s*)|\G(\\s*\\))|\G(\\[\\s*)|\G(\\s*\\])|\G(\\s*->\\s*)|\G(\\s*=>\\s*)|\G(\\s*=\\s*)|\G(\\+\\+|--)|\G(\\s*(\\+|-)\\s*)|\G(\\s*(\\*|\/|%)\\s*)|\G(\\$)|\G(\\s*;)|\G(::)|\G(\\s*:\\s*)|\G(@)|\G(#)|\G(\")|\G(`)|\G(\\|)|\G(\\.)|\G(\\s*,\\s*)|\G(\\s*&\\s*)|\G(\\s*\\?\\s*)|\G(0[xX][0-9a-fA-F]+)|\G([0-9]*[a-zA-Z_]\\w*)|\G(\\d+)|\G(\\s+)|\G(.)/iS";
 
         do {
-            if (preg_match($yy_global_pattern,$this->data, $yymatches, null, $this->counter)) {
+            if ($this->mbstring_overload ? preg_match($yy_global_pattern, substr($this->data, $this->counter), $yymatches) : preg_match($yy_global_pattern,$this->data, $yymatches, null, $this->counter)) {
                 $yysubmatches = $yymatches;
                 $yymatches = array_filter($yymatches, 'strlen'); // remove empty sub-patterns
                 if (!count($yymatches)) {
@@ -904,7 +905,7 @@ class Smarty_Internal_Templatelexer
         $yy_global_pattern = "/\G(".$this->ldel."\\s*literal\\s*".$this->rdel.")|\G(".$this->ldel."\\s*\/literal\\s*".$this->rdel.")|\G([\t ]*[\r\n]+[\t ]*)|\G(<\\?(?:php\\w+|=|[a-zA-Z]+)?)|\G(\\?>)|\G(<%)|\G(%>)|\G(([\S\s]*?)(?=([\t ]*[\r\n]+[\t ]*|".$this->ldel."\/?literal".$this->rdel."|<\\?|<%)))|\G(.)/iS";
 
         do {
-            if (preg_match($yy_global_pattern,$this->data, $yymatches, null, $this->counter)) {
+            if ($this->mbstring_overload ? preg_match($yy_global_pattern, substr($this->data, $this->counter), $yymatches) : preg_match($yy_global_pattern,$this->data, $yymatches, null, $this->counter)) {
                 $yysubmatches = $yymatches;
                 $yymatches = array_filter($yymatches, 'strlen'); // remove empty sub-patterns
                 if (!count($yymatches)) {
@@ -1029,7 +1030,7 @@ class Smarty_Internal_Templatelexer
         $yy_global_pattern = "/\G(".$this->ldel."\\s{1,}\/)|\G(".$this->ldel."\\s*(if|elseif|else if|while)\\s+)|\G(".$this->ldel."\\s*for\\s+)|\G(".$this->ldel."\\s*foreach(?![^\s]))|\G(".$this->ldel."\\s{1,})|\G(".$this->ldel."\/)|\G(".$this->ldel.")|\G(\")|\G(`\\$)|\G(\\$[0-9]*[a-zA-Z_]\\w*)|\G(\\$)|\G(([^\"\\\\]*?)((?:\\\\.[^\"\\\\]*?)*?)(?=(".$this->ldel."|\\$|`\\$|\")))|\G([\S\s]+)|\G(.)/iS";
 
         do {
-            if (preg_match($yy_global_pattern,$this->data, $yymatches, null, $this->counter)) {
+            if ($this->mbstring_overload ? preg_match($yy_global_pattern, substr($this->data, $this->counter), $yymatches) : preg_match($yy_global_pattern,$this->data, $yymatches, null, $this->counter)) {
                 $yysubmatches = $yymatches;
                 $yymatches = array_filter($yymatches, 'strlen'); // remove empty sub-patterns
                 if (!count($yymatches)) {
diff --git a/libs/sysplugins/smarty_internal_templateparser.php b/libs/sysplugins/smarty_internal_templateparser.php
index 663381a8..6dfdeeff 100644
--- a/libs/sysplugins/smarty_internal_templateparser.php
+++ b/libs/sysplugins/smarty_internal_templateparser.php
@@ -1,4 +1,14 @@
 <?php
+/**
+* Smarty Internal Plugin Templateparser
+*
+* This is the template parser.
+* It is generated from the internal.templateparser.y file
+* @package Smarty
+* @subpackage Compiler
+* @author Uwe Tews
+*/
+
 class TP_yyToken implements ArrayAccess
 {
     public $string = '';