An idea for you:
my $foo ="some hello message";
my ($hello) = $foo =~ /(hello)/;
$hello //= ''; # null string if "hello" was not found
$hello will be either "hello" or
a null string. Better than an undef value.
Amongst other things, this maintains a
"printable value" for $hello.
use $hello in a Boolean context.
$foo is a string. Do not reuse that string
variable name to mean something different.
Create new Boolean variable.
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