fix for acronyms, but still buggy

The last change introduced a bug where acronyms inside words where
marked. This fixes it partly. However there is still a bug - the
following line gets both occurences of 'spec' marked as acronym and
I don't know why:

This is the specification also called spec.

Only the last occurence of spec should be marked but both are. If
the latter is missing the first one isn't marked as well.

Any help appreciated.

darcs-hash:20050914144810-7ad00-9e486e207cb856524a044a1d6d3ed07dbb534864.gz

inc/parser/parser.php

@@ -623,9 +623,9 @@ class Doku_Parser_Mode_acronym extends Doku_Parser_Mode {
     }
     
     function preConnect() {
-        $bound = '[\x00-\x2f\x3a-\x3f\x5b-\x7f]';
+        $bound = '[\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\x7f]';
         $acronyms = array_map('Doku_Lexer_Escape',$this->acronyms);
-        $this->pattern = '(?<='.$bound.')(?:'.join('|',$acronyms).')(?='.$bound.')';
+        $this->pattern = '(?<=^|'.$bound.')(?:'.join('|',$acronyms).')(?='.$bound.')';
     }
     
     function connectTo($mode) {