$username =~ /(cyc(\|\/)(.*?)/;

##</code><code>##

($username) = $ENV{REMOTE_USER} =~ /cyc(?:\\|\/)(.+)/;
($username) = $ENV{REMOTE_USER} =~ /cyc[\/\\](.+)/;
# And to cleanup a little
($username) = $ENV{REMOTE_USER} =~ m{cyc(?:\\|/)(.+)};
($username) = $ENV{REMOTE_USER} =~ m{cyc[/\\](.+)};

##</code><code>##

perl -e 'my ($a,$b) = split("\\|/","a/b"); print "a:$a\nb:$b\n"'   
a:a/b
b:

##</code><code>##

perl -MO=Deparse -e 'my ($a,$b) = split("\\|/","a/b");'           
my($a, $b) = split(m[\|/], 'a/b', 3);

perl -e 'my ($a,$b) = split("\\|/","a|/b"); print "a:$a\nb:$b\n"' 
a:a
b:b