Interesting! 
[keszler@tek src]# perl -le '
$x = "asdfXXsadf";
print "match" if $x =~ /\QXX\E/;
'
match
[keszler@tek src]# perl -le '
$x = "asdf@@sadf";
print "match" if $x =~ /@@/;
'
[keszler@tek src]# perl -le '
$x = "asdf@@sadf";
print "match" if $x =~ /\Q@@\E/;
'
[keszler@tek src]# perl -le '
$x = "asdf@@sadf";
print "match" if $x =~ /\@\@/;
'
[keszler@tek src]# perl -le '
$x = "asdf@@sadf";
print "match" if $x =~ /@/;
'
match
[keszler@tek src]# perl -le '
$x = "asdf@@sadf";
print "match" if $x =~ /@{2}/;
'
match

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In reply to Re: regular expression with @@/ by keszler
in thread regular expression with @@/ by jim_neophyte

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