Silicon Valley Perl (SVPerl) is for people interested in the Perl programming language in the Silicon Valley area - engineers and coders, or other users. A previous Perl Mongers group existed in the area until 2005. SVPerl re-established the Perl group in 2010. See SVPerl's web site at http://svperl.org/ (http://svperl.org/)
If Regex makes you a master of text manipulation, Pack/Unpack makes you a master of binary data manipulation. Be aware that binary data manipulation is something you might not do very often, but when you do, pack/unpack will be your best friend.
Perl is not required. Pack/Unpack has been ported to multiple languages.