What's the difference between single and double quotes in Perl?

Question

In Perl, what is the difference between \' and \" ?

For example, I have 2 variables like below:

$var1 = \'\\(\';
$var2 = \"         


        

Answer 1

If you are going to create regex strings you should really be using the qr// quote-like operator:

my $matchStr = "(";
my $var1 = qr/\(/;
my $res1 = ($matchStr =~ m/$var1/);

It creates a compiled regex that is much faster than just using a variable containing string. It also will return a string if not used in a regex context, so you can say things like

print "$var1\n"; #prints (?-xism:\()