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  1. or download this
    $users_regexp = qr/^./s;
'abc,v' = /$users_regex(?!,v$)/;  # Matches, but it shouldn't.
...

$users_regexp = qr/,/;
'abc,v' = /$users_regex(?!,v$)/;  # Matches, but it shouldn't.
  2. or download this
    /^(?=.*?$users_regex)(?!.*?,v$)/s
  3. or download this
    /^(?!.*,v$).*?$users_regex/s