How do I get the value of a number that is part of a string?

[vroom]

How do I get the value of a number that is part of a string?

Originally posted as a Categorized Question.

[chromatic]

Perl will automatically do the right thing with a scalar depending on the context in which you use it. If you were to say:

my $x = "1";
my $y = "2";
print $x + $y, "\n";

you'll get 3. If you say:

my $x = "1";
my $y = "2";
print $x . $y, "\n";

you'll get 12 ("2" appended to "1"). To force interpretation in a numeric context, you can try:

my $x = "10abc";
print $x + 0, "\n";

and you'll get 10. Note that this only works on scalars starting with digits. Strip them out with a regex if you need to.

[lalitbans]

$_ = "answer4u";
/(\d+);
$num = $1;

or:

$_ = "answer4u";
($num) = /(\d+)/;