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00117: PmWiki generating null llinks ('/')

Description: At least, I think it's a bug. Description and example follow.

 $PageNameChars = '-_~[:alnum:]';
     $NamePattern = '[[:upper:]\\d][\\w]*(?:[-~]\\w+)*';
     Markup('[[_','<links','/\[\[_([^\|\]]+)\]\]/e',
    "'[[' . preg_replace('/~.*$/','',FmtPageName('\$Name',\$pagename)) .
    PSS('~$1 | ~$1') . ']]'");
 

If I write [[_Child]] this should produce a link to PITS.00117~Child. Instead it produces a link to '/' -- a null page. It is definitely generating [[PITS.00117~Child | ~Child]], but PmWiki doesn't like it. However, the following code

 $PageNameChars = '-_~[:alnum:]';
    $NamePattern = '[[:upper:]\\d][\\w]*(?:[-~]\\w+)*';
    Markup('[[_','<links','/\[\[(_[^\|\]]+)\]\]/e',
    "'[[' . preg_replace('/_.*$/','',FmtPageName('\$Name',\$pagename)) .
    PSS('$1 | $1') . ']]'");
 

correctly produces a link to the page PITS.00117_Child. Either it's a bug or something so obvious I can't see it. I get the same problem when using other characters, like a \* instead of _.