fix bug in regex_replace where a \0 character ingores the rest of the line

NEWS

@@ -1,3 +1,8 @@
+Version 2.6.19 (Feb 11th, 2008)
+-------------------------------
+
+- fix regex_replace allowing \0 in the search string (c960657,
+  monte)
 - add append feature to {capture} (jablko, monte)
 - fix when (un)registering filters with the same method name but different class
   name (danilo)

libs/plugins/modifier.regex_replace.php

@@ -22,6 +22,8 @@
  */
 function smarty_modifier_regex_replace($string, $search, $replace)
 {
+    if (($pos = strpos($search,"\0")) !== false)
+      $search = substr($search,0,$pos);
     if (preg_match('!([a-zA-Z\s]+)$!s', $search, $match) && (strpos($match[1], 'e') !== false)) {
         /* remove eval-modifier from $search */
         $search = substr($search, 0, -strlen($match[1])) . preg_replace('![e\s]+!', '', $match[1]);