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.
Snippets of code should be wrapped in
<code> tags not<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor