http://www.perlmonks.org?node_id=1069922


in reply to Regex to capture every readable character except COMMA

OK, this may not be relevant if you want/need extended functionality like abbreviations (\d \s \w), capture groups etc, but an "old school" regex like
^[^,]$
has the additional benefit that you can try it out in your editor (vi, Notepad++, etc.)