Perl Variable value is representing another variable

Question

my $var = \"Hello\";
my $Hello = \"Hi\";

my question is: how can I substitute the value of $Hello in $var? Here $var contains string \"Hello\" (there i

Answer 1

If you are willing to fill a placeholder in a string with the value of a variable, you could use :

my $Hello = "Hi";
my $var = "$Hello world";
# $var is now "Hi world"

If you want to replace each occurence of some variable name, you can use :

my $Hello = "Hi";
my $greet = "Hello, my name is Jimbo, and I hate Helloween.";
$greet =~ s/Hello/$Hello/g;
# $greet is now "Hi, my name is Jimbo, and I hate Hiween.";

Like proposed by DVK, eval could also partially do the trick :

my $Hello = "Hi";
my $greet = "\$Hello, my name is Jimbo, and I hate \$Helloween.";
$greet = eval "\"$greet\"";
# $greep is now "Hi, my name is Jimbo, and I hate ."

Edit: Sorry for the briefness of my previous answer, I typed it on my phone in a waiting room...