Changed variable name because Eloy has plans for $CFG->filtermatchoneperpage :-)

config-dist.php

@@ -209,7 +209,7 @@ $CFG->admin = 'admin';
 //
 // Enabling this will make most text-based filters only match the first time
 // a phrase occurs in a given text.  Otherwise all are matched.
-//      $CFG->filtermatchfirstonly = true;
+//      $CFG->filtermatchonepertext = true;
 
 //=========================================================================
 // ALL DONE!  To continue installation, visit your main page with a browser

lib/filterlib.php

@@ -149,7 +149,7 @@ function filter_phrases ($text, $link_array, $ignoretagsopen=NULL, $ignoretagscl
         }
 
     /// Finally we do our highlighting
-        if (!empty($CFG->filtermatchfirstonly)) {
+        if (!empty($CFG->filtermatchonepertext)) {
             $text = preg_replace('/('.$linkobject->phrase.')/'.$modifiers, 
                                       $linkobject->hreftagbegin.'$1'.$linkobject->hreftagend, $text, 1);
         } else {